Veterinary · Public health, regulation and professional practice · also State Veterinary Medicine, Veterinary Services
How national Veterinary Services work: notifiable-disease reporting, quarantine and movement control, certification, import risk analysis, WTO-SPS and WOAH Codes, and emergency disease response.
In the exams: SAVC Paper 4 State veterinary medicine 35 (its largest single section); WOAH Day 1 advanced competences; Korea veterinary law and animal husbandry 20
Regulatory or state veterinary medicine is the part of the profession that acts for the public rather than for one owner. A state veterinarian decides whether a disease must be reported, whether a farm is placed under restriction, whether a consignment may cross a border, whether an animal is killed to protect the national herd and what the owner is paid for it. The same person may sign an export certificate on Monday, lead an outbreak investigation on Tuesday and draft a vaccination budget on Wednesday. The work rests on law, on international standards and on public trust, and it is judged by trading partners as much as by farmers.
The subject has a clear global architecture. The World Organisation for Animal Health (WOAH, founded in 1924 as the Office International des Epizooties, OIE) writes the animal-health standards: the Terrestrial Animal Health Code, the Aquatic Animal Health Code and the two Manuals of diagnostic tests and vaccines. The World Trade Organization's Agreement on the Application of Sanitary and Phytosanitary Measures (the SPS Agreement) makes those standards the benchmark against which a country's import rules are tested. Each country then builds its own Veterinary Services, disease law, border controls and emergency plans, and WOAH's Performance of Veterinary Services (PVS) Pathway measures how well it has done so.
This manual follows the ten units of the curriculum: the organisation of Veterinary Services, notifiable disease reporting, quarantine, movement control, veterinary certification, import risk analysis, the SPS Agreement, the WOAH Codes, emergency disease response, and India's national programmes. Where national law differs, the manual says so and gives examples from several countries rather than one model. Professional regulation and forensic work sit in jurisprudence; the One Health and antimicrobial-resistance frameworks sit in one-health-amr; detailed meat and milk inspection sits in milk and meat hygiene. This subject links them through the official role.
Examiners weight it heavily where a veterinarian works for the state. South Africa's SAVC registration examination gives state veterinary medicine its largest single section, Korea's national examination has a veterinary-law paper, Indian state public service commissions recruit veterinary officers who will run vaccination and disease-reporting programmes, and the WOAH Day 1 competencies list certification, notification and transboundary disease control among the competences it recommends for new graduates, the advanced ones being aimed at graduates entering the official Veterinary Services.
The WOAH Terrestrial Code uses precise terms that every state veterinarian should be able to define. Veterinary Services are the combination of governmental and non-governmental organisations that implement animal health and welfare measures and the other standards of the Code in a territory. The Veterinary Authority is the governmental authority, made up of veterinarians, other professionals and paraprofessionals, that has responsibility and competence across the whole territory for those measures, including international veterinary certification; it oversees the Veterinary Services. The Competent Authority is the Veterinary Authority or another governmental authority with responsibility for a defined task, such as a food-safety agency. An Official Veterinarian is a veterinarian authorised by the Veterinary Authority to perform specified official tasks, such as certification or official inspection. A veterinary paraprofessional performs tasks delegated under the responsibility and direction of a veterinarian, and the veterinary statutory body regulates veterinarians and paraprofessionals.
The distinction matters. Private veterinarians who vaccinate under an official programme, or who are accredited to sign certificates, are part of the Veterinary Services without being employees of the Veterinary Authority. In the United States, accredited private veterinarians sign many interstate and export documents; in much of Europe, official veterinarians in abattoirs may be private practitioners appointed for the task; in India and many African and Asian countries, most field veterinarians are state employees of a department of animal husbandry. Every model works only if the chain of command is clear: who reports to whom, who can impose a restriction, and who answers to WOAH. The Chief Veterinary Officer (CVO) usually serves as the country's WOAH Delegate and is the single official voice on animal-health status.
The Code sets out fundamental principles of quality for Veterinary Services. They are professional judgement, independence (staff free from commercial, financial, hierarchical or political pressure that could affect their decisions), impartiality, integrity, objectivity, a sound legislative base, general organisation that can act from the centre to the field, a quality policy, procedures and standards, information and communication systems, adequate human and financial resources, and documentation and self-evaluation. These principles are why certification by a Veterinary Service carries weight abroad: a trading partner accepts a certificate because it trusts the system behind the signature.
In practice the hardest principle is independence. A field officer who is told by a local politician to delay reporting an outbreak during a festival season, or an abattoir official veterinarian paid per carcass passed by the slaughterhouse owner, faces exactly the pressure the Code warns against. Good organisation removes the conflict through structure: salaries paid by the state or through a neutral fee mechanism, a direct reporting line to the CVO for notifiable events, and written procedures that protect the officer who follows them.
Veterinary legislation is treated as part of quality. The Code's chapter on veterinary legislation says the law should give the Veterinary Authority powers of entry, inspection, seizure, movement control, killing and disposal, should define offences and penalties, should provide for compensation, and should be drafted with stakeholders so it can be enforced. Many countries still operate under laws written a century ago; legislative review is a frequent outcome of WOAH missions.
The PVS Pathway is WOAH's programme for helping Members evaluate and improve their Veterinary Services. Its core instrument is the PVS Tool, which groups critical competencies under four fundamental components: human, physical and financial resources; technical authority and capability; interaction with interested parties; and access to markets. Each critical competency is scored on five levels of advancement, from level 1 (no or minimal capacity) to level 5 (full compliance with WOAH standards). The 2019 edition of the Tool lists 45 critical competencies, among them veterinary staffing, laboratory diagnosis, surveillance, emergency response, quarantine and border security, identification and traceability, certification, and veterinary legislation.
The Pathway is staged. An orientation phase trains national staff. A PVS Evaluation is an external, qualitative assessment by WOAH-trained experts, done at the request of the country and published only with its consent. A PVS Gap Analysis then costs what the country needs to reach the levels it sets itself, producing a strategic plan and budget. Targeted support follows: legislative support, laboratory missions, sustainable laboratories, and PVS-IHR National Bridging Workshops that join animal-health and human-health services under the International Health Regulations. Follow-up evaluations measure progress. The Pathway is voluntary and confidential by default, which is why it is trusted.
Behind any national structure sit a few recurring units: a central animal health directorate, a field network of district or provincial officers and paraprofessionals, a national and regional diagnostic laboratory network, an epidemiology and information unit, border inspection posts, and food-of-animal-origin inspection either within the Veterinary Authority or in a separate food agency. Information systems also include livestock statistics. India runs a quinquennial livestock census; its 20th census, in 2019, counted about 535.8 million livestock, and the 21st began in 2024. FAOSTAT compiles national figures worldwide. Census data set vaccine orders, surveillance sample frames and compensation budgets, so poor statistics weaken every programme that depends on them.
A notifiable (or reportable) disease is one that national law requires to be reported to the Veterinary Authority, usually on suspicion rather than confirmation. The list is set by each country, normally in a schedule to its animal-health act that can be amended by order, and it typically includes the transboundary diseases on the WOAH list plus diseases of national importance. Who must report differs: in most systems the owner or keeper, any veterinarian, and laboratory staff who detect the agent all have a duty; some laws extend it to transporters, abattoir operators and village officials.
Examples show the variety. In Great Britain the Animal Health Act 1981 is the main enabling act, and suspicion of a notifiable disease must be reported to the Animal and Plant Health Agency (APHA); failing to report is an offence. In the European Union the Animal Health Law, Regulation (EU) 2016/429, applies from 21 April 2021 and sorts listed diseases into categories A to E: category A diseases do not normally occur in the Union and need immediate eradication; B must be controlled with the aim of eradication; C are subject to optional eradication programmes; D need measures against spread on entry or movement; and E need surveillance. The United States keeps a National List of Reportable Animal Diseases maintained by USDA APHIS, alongside state reportable lists. India's Prevention and Control of Infectious and Contagious Diseases in Animals Act, 2009 schedules the diseases and requires reporting to the authorities, with state animal husbandry departments enforcing it. South Africa's Animal Diseases Act 35 of 1984 distinguishes controlled and notifiable diseases. Korea's law on the prevention of contagious animal diseases sorts them into classes.
Reporting on suspicion is the core principle. A farmer or practitioner who waits for laboratory confirmation loses days in which a fast-spreading disease such as foot-and-mouth disease (FMD) or highly pathogenic avian influenza (HPAI) can travel through markets and vehicles.
Members of WOAH accept an obligation to report. The Terrestrial Code, Chapter 1.1, requires the Veterinary Authority to notify WOAH within 24 hours, through the World Animal Health Information System (WAHIS), of certain events. These are: the first occurrence of a listed disease or infection in a country, zone or compartment; a recurrence after the country or zone had been declared free; the first occurrence of a new strain of a listed disease agent; a sudden and unexpected change in the distribution, or an increase in incidence, virulence, morbidity or mortality, of a listed disease; an emerging disease with significant morbidity, mortality or zoonotic potential; and evidence of a change in the epidemiology of a listed disease, such as a new host species. After an immediate notification the country sends follow-up reports, normally weekly, until the event is resolved or becomes stable endemic, which is then covered by six-monthly reports. An annual report covers other information, including the Veterinary Services and animal populations.
The WOAH list is decided by the World Assembly using criteria in Chapter 1.2: international spread, significant spread within naive populations, zoonotic potential, and emerging status. The list includes multispecies diseases (for example anthrax, rabies, FMD, Rift Valley fever), and diseases of cattle, sheep and goats, pigs, horses, birds, bees, lagomorphs and camelids, with aquatic diseases listed separately in the Aquatic Code.
Reporting can be costly in the short term because trading partners may close their markets. The Code and the SPS Agreement try to reward transparency: partners are expected to apply measures proportionate to the risk and to accept zoning, and WOAH's official status recognition depends on a record of honest reporting.
Law alone does not produce reports. Farmers report when they trust that the response will be fair, quick and compensated, and when they know what to look for. Practitioners report when the process is simple and when they are not blamed for a false alarm. Several design features are known to improve reporting. A single, well-advertised telephone number or app reaches an on-call officer at any hour. Clear case definitions for suspicion are given to practitioners and paraprofessionals. Compensation for animals killed is paid promptly at a fair value; delayed or token compensation is one of the commonest reasons for hidden outbreaks. Sample collection kits, cold chain and transport to the laboratory are funded. Feedback is given to those who report.
Passive surveillance of this kind is supplemented by active surveillance, such as serological surveys, abattoir sampling, and targeted sampling of high-risk populations, and by participatory surveillance with livestock keepers in pastoral areas. In India the National Animal Disease Reporting System (NADRS) was developed to link block, district and state reporting to the centre, and ICAR-NIVEDI in Bengaluru runs a disease forecasting service. Many African and Asian countries use mobile-phone reporting through paraprofessionals.
When a suspicion is reported, the standard sequence is: the official veterinarian visits, examines and records; samples are taken and sent to the designated laboratory; the premises is placed under a preliminary restriction notice pending results; tracing of movements on and off the premises begins; and, on confirmation, the national contingency plan is activated and WOAH is notified if the event meets Chapter 1.1 criteria.
Quarantine is the isolation of animals that may be infected, under official control, for a set period while they are observed, tested or treated, so that infection is not passed to other animals. It is different from isolation of animals known to be sick and from movement restriction of a whole premises. The period is chosen from the incubation period of the diseases of concern and the time needed for testing; the WOAH disease chapters give incubation or infective periods that importing countries use when setting it. Quarantine periods are therefore set by each importing country, species and disease, and vary widely.
Three main types are used in trade. Pre-export quarantine (pre-export isolation) takes place in the exporting country, in premises approved by its Veterinary Authority, before shipment; tests required by the importing country are done during this time. Post-arrival or post-entry quarantine takes place in the importing country, in a government station or in approved private premises. Quarantine in transit applies at stopovers. A fourth use is domestic: animals moved into a free zone, or into a herd under a health scheme, may be quarantined on the farm before mixing.
A quarantine station must provide physical separation from other animals, controlled entry of people and vehicles, separate equipment, safe disposal of manure, bedding and carcasses, cleaning and disinfection facilities, and an all-in, all-out operation so that a group finishes together and the station is cleaned before the next group arrives. Insect-proofing is needed where the diseases of concern are vector-borne, such as bluetongue or African horse sickness.
Most countries run an animal quarantine and certification service at airports, seaports and land borders. Its tasks are to check import permits and health certificates, inspect animals and products, verify identity, take samples, refuse or destroy non-compliant consignments, supervise quarantine, and issue export certificates. In India the Animal Quarantine and Certification Services (AQCS) operate stations at Delhi, Mumbai, Chennai, Kolkata, Hyderabad and Bengaluru under the Department of Animal Husbandry and Dairying, working under the Livestock Importation Act, 1898, which was amended to cover livestock products. In Australia the Biosecurity Act 2015 provides the legal basis for border biosecurity, and in the European Union animals and products of animal origin enter through designated border control posts under the official controls regulation, Regulation (EU) 2017/625.
Border work also deals with passengers' luggage, international mail and catering waste from ships and aircraft. Meat products carried illegally by travellers are a recognised route for African swine fever and FMD, and swill feeding of such waste to pigs has started major outbreaks. Detector dogs, X-ray screening, amnesty bins and penalties are used against this route.
Quarantine of companion animals has changed in several countries. Rabies-free islands once required months of quarantine for imported dogs and cats; many now accept a scheme of microchipping, rabies vaccination, a serological test showing an adequate antibody titre, and a waiting period, with quarantine only when the conditions are not met. The exact requirements differ by country and must be checked on the importing country's official site.
A quarantine officer works to a written protocol based on the import conditions. On arrival, animals are counted and their identity checked against the certificate; any animal that is dead, sick or not identified is recorded and handled under the protocol. Clinical inspection is repeated during the period. Samples are taken at times that allow the tests to be meaningful, for example after the end of the window in which an animal infected just before shipment would still be seronegative. Positive results trigger re-testing, exclusion of the reactor, extension of quarantine for the group, or rejection of the whole consignment, depending on the disease and the protocol.
Because a quarantine group shares air, water and handlers, a single positive animal means the others are exposed. The usual response is to reset the clock for the remaining animals and retest them, rather than simply removing the reactor and releasing the rest on the original date. Releasing on time after a positive result is a classic error that examiners test.
Records are as important as the animals. Each consignment should have a file that holds the permit, certificate, arrival inspection, daily observations, sample submissions, laboratory results, treatments, decisions and release or destruction. These records support the importing country's audit, any later outbreak tracing, and any legal challenge by the importer. Quarantine failures that are later traced back usually show a broken procedure rather than an unknown disease.
Animal movement is the commonest way that infectious disease spreads between herds and regions. Animals carry infection during the incubation period before signs show; markets mix animals from many sources; vehicles, people and fomites travel with them. Movement control is therefore the first and cheapest emergency measure, and a permanent feature of disease-free zones.
Routine controls include movement permits or certificates for moves between zones or states; movement reporting so that a central database knows where each animal is; standstill rules that stop animals leaving a holding for a set number of days after an animal has arrived, so that an introduced infection can show itself before the herd spreads it further; and approval and cleansing rules for markets and transport vehicles. Great Britain introduced a standstill after the 2001 FMD epidemic, when sheep moved through markets had spread infection widely before the first case was confirmed; the standstill applies to cattle, sheep and goats, with separate rules for pigs.
In an outbreak, controls tighten. The infected premises is placed under restriction. Around it, zones are declared in which movements are banned or licensed. In the EU, the minimum radius is 3 km for a protection zone and 10 km for a surveillance zone for diseases such as FMD and HPAI, under Commission Delegated Regulation (EU) 2020/687; other countries use their own distances, and India's avian influenza action plan defines an infected zone of 1 km and a surveillance zone of 10 km around the epicentre. National standstills of all susceptible species may be declared in the first days of a major epidemic until the extent is known.
The WOAH Code allows a country to define parts of its territory, or parts of its production system, with a distinct health status. A zone is a clearly defined part of a territory containing an animal subpopulation with a distinct health status, separated mainly by geography: natural or artificial barriers, surveillance and movement control. A compartment is an animal subpopulation contained in one or more establishments under a common biosecurity management system, with a distinct health status; it is defined mainly by management and biosecurity rather than geography, and suits commercial poultry or pig systems. A protection zone may be set up inside a free country or zone to guard against incursion from a neighbouring country of different status. A containment zone is set up around outbreaks in a free country or zone, so that the rest of the territory can regain free status quickly without waiting for the whole country to recover.
These concepts depend on movement control and traceability: a zone or compartment is only as good as the controls at its edges and the ability to prove where its animals came from. Trading partners are expected under the SPS Agreement to recognise zones and compartments that meet the Code, though in practice recognition can be slow.
Animal identification is the combination of identifying and registering an animal individually, with a unique identifier, or collectively by its epidemiological unit or group. Animal traceability is the ability to follow an animal or group during all stages of its life. WOAH sets out general principles and a design guide: define the objectives (disease control, residue control, ownership, breeding), the scope (species, sectors), the identifiers, the registration of holdings, the reporting of events such as birth, movement, slaughter and death, the database, and the legal and financial basis.
Identifiers include ear tags (visual, or electronic with radio-frequency identification), rumen boluses, injectable transponders, tattoos, freeze or hot brands, and natural features such as muzzle prints or iris patterns. Pigs and poultry are usually identified by batch or lot rather than individually. In the EU, bovine animals carry two ear tags with the same unique number and a movement record, under Regulation (EC) No 1760/2000, a system built after the BSE crisis. In India, cattle and buffaloes under national vaccination programmes have been tagged with 12-digit unique ear tags and recorded on the Information Network for Animal Productivity and Health (INAPH), which is being succeeded by the National Digital Livestock Mission database known as Bharat Pashudhan.
The test of a system is speed: how fast officials can list every holding that an infected animal passed through and every animal that shared a holding with it. A system that records tags but not movements cannot answer that question.
An international veterinary certificate is a document, issued by the Veterinary Authority of the exporting country, that describes animal-health or public-health requirements and states that the commodity meets them. It is signed by a certifying veterinarian, normally an Official Veterinarian authorised by the Veterinary Authority. Certificates cover live animals, germplasm (semen, embryos, hatching eggs), products of animal origin such as meat, milk products and hides, animal feed, pathological material and biological products.
The Code, Section 5, sets out the obligations. The importing country should base its requirements on WOAH standards, or on a risk analysis, and should not ask for conditions that the exporting country cannot reasonably certify. The exporting country should provide information on its health situation and its Veterinary Services. Certificates should be kept simple and clear; they should use model forms where WOAH provides them; the requirements should be agreed between the two Veterinary Authorities before trade begins. Codex Alimentarius guidelines cover official certificates for food, and the two systems are designed to be compatible.
The Code's principles for certifying veterinarians are short and strict. The veterinarian should certify only matters within their own knowledge at the time of signing, or that have been ascertained by another competent party authorised by the Veterinary Authority. They should sign only at the appropriate time and only when the certificate is fully and correctly completed; where a certificate is signed on the basis of supporting documentation, the veterinarian should have that documentation before signing. They should have no conflict of interest in the commercial aspects of the animals or products being certified, and should be independent of the commercial parties.
These principles echo professional codes such as the RCVS principles of certification, which jurisprudence covers in more detail. The practical rules follow from them. A certificate should be on official stationery or an official electronic system, carry a unique number, be completed in the language or languages agreed with the importing country, and have no unauthorised alterations; deletions must be signed and stamped. Each page of a multi-page certificate should be numbered and linked. Copies should be kept. The certifier should never sign a blank or partly completed form, never certify a test result they have not seen, and never certify freedom of a region from a disease without a basis in official surveillance data.
Certification fraud, such as forged signatures, recycled certificates and laundering of animals from an infected area through a free one, undermines trust in a whole country's exports. Electronic certification, in which certificates pass directly between Veterinary Authorities through secure systems, reduces fraud and delay; WOAH and Codex have guidance on it, and several large trading partners now exchange certificates electronically.
Certification of meat, milk products, fish and eggs rests on official controls along the food chain. Official controls are the activities of the Competent Authority to verify that operators comply with food and feed law: registration or approval of establishments, ante- and post-mortem inspection in slaughterhouses, audit of the operator's hazard analysis and critical control point (HACCP) plan, sampling for residues and contaminants, and checks on labelling and traceability. The legal model differs. In the EU, Regulation (EU) 2017/625 governs official controls along the agri-food chain, including the role of official veterinarians in slaughterhouses. In the United States, meat and poultry inspection is a federal function under USDA's Food Safety and Inspection Service. In India, the Food Safety and Standards Authority of India sets food standards, while export meat plants are registered with the Agricultural and Processed Food Products Export Development Authority and inspected with the state veterinary departments.
The certifier's part is narrow but crucial: an export health certificate for meat typically states that the animals came from a region meeting the importer's animal-health conditions, passed ante- and post-mortem inspection, were slaughtered and processed in an approved establishment, and that the product is fit for human consumption and meets residue requirements. Each statement must be backed by records from the establishment and the official control system. Detailed inspection procedures, residue limits and HACCP belong to the milk and meat hygiene subject.
Import risk analysis is the structured process by which an importing country decides whether, and under what conditions, to import a commodity that might bring in a disease. The Terrestrial Code, Chapter 2.1, describes four components: hazard identification, risk assessment, risk management and risk communication. If an import is covered by a WOAH standard and the importing country accepts that standard's level of protection, a full risk analysis is not needed; the analysis is required where the country wants a measure stricter than the standard, or where no standard exists.
Hazard identification lists the pathogenic agents that could cause harm and could be present in the commodity, and asks whether each is already present in the importing country, notifiable or under control there. A pathogen absent from the exporting country, or already widespread and uncontrolled in the importing country, may be removed from further assessment.
Risk assessment estimates the likelihood and consequences of each hazard. It has four steps: entry assessment (formerly called release assessment) describes the pathway by which the agent could enter in the commodity and estimates its probability; exposure assessment describes how susceptible animals or people in the importing country could be exposed and estimates that probability; consequence assessment describes the direct consequences, such as animal losses and public-health effects, and indirect ones, such as control costs and trade losses; and risk estimation integrates the three into an overall measure of risk. Assessments may be qualitative, using categories such as negligible, low, medium and high, or quantitative, using probability distributions; both are accepted if transparent.
Risk management is the process of deciding on and applying measures so that the risk is reduced to the importing country's appropriate level of protection, while keeping negative trade effects to a minimum. It has four steps: risk evaluation compares the estimated risk with the acceptable level; option evaluation identifies and assesses possible measures, such as country or zone freedom, pre-export testing, quarantine, vaccination, treatment of the product (heat, pH, curing) and certification; implementation puts the chosen measures into effect; and monitoring and review checks that they work.
Risk communication is the exchange of information and opinions on hazards and risks among risk assessors, managers and interested parties, from the start of the analysis to the end. It includes publishing the draft analysis and inviting comment from the exporting country and domestic industry. An analysis that surprises stakeholders at the end, or that cannot be read by the exporting country, will be challenged.
Uncertainty and variability should be stated. Uncertainty is lack of knowledge, such as a test's sensitivity measured in a small study; variability is real difference between units, such as prevalence between herds. Sensitivity analysis shows which inputs drive the result and where better data would change the decision. Codex uses a related but distinct framework for food-safety risk: hazard identification, hazard characterisation, exposure assessment and risk characterisation.
Simple probability calculations sit at the core of many entry assessments, and examiners use them. If the prevalence of infection in the source population is p and n animals are selected at random, the probability that at least one infected animal is in the consignment is 1 − (1 − p)^n. With p = 0.02 and n = 50 this is 1 − 0.98^50, about 0.64. If each animal is tested before export with a test of sensitivity Se, an infected animal passes undetected with probability 1 − Se, so the probability that a single animal is both infected and undetected is p × (1 − Se). With Se = 0.9, that is 0.002 per animal, and for 50 animals 1 − 0.998^50, about 0.095. Testing reduces but does not remove the risk; a second test in series, or quarantine with retesting, reduces it further.
The same logic underpins surveys to demonstrate freedom. For a large population and a perfect test, the number of animals to sample so as to detect at least one positive with confidence C, if the disease were present at the design prevalence P, is n = ln(1 − C) / ln(1 − P). For 95% confidence and 5% design prevalence, n = ln 0.05 / ln 0.95, which is about 58.4, so 59 animals. Imperfect sensitivity raises the number.
Risk assessors should state assumptions plainly: random selection, independence between animals, test performance in the target species, and the time between testing and shipment. Clustered infection within herds breaks the independence assumption and usually means the simple formula underestimates the probability that a consignment from one infected herd contains several infected animals.
The Agreement on the Application of Sanitary and Phytosanitary Measures entered into force with the establishment of the World Trade Organization on 1 January 1995, as one of the results of the Uruguay Round. It applies to measures taken to protect human or animal life or health from risks arising from additives, contaminants, toxins or disease-causing organisms in food, beverages or feed; to protect human life from diseases carried by animals, plants or their products; to protect animal or plant life from pests, diseases and disease-causing organisms; and to prevent other damage from the entry or spread of pests. Import bans, testing, quarantine, certification, residue limits and processing requirements are all SPS measures when used for these purposes.
The Agreement names three international standard-setting bodies, often called the three sisters: the Codex Alimentarius Commission for food safety, the World Organisation for Animal Health for animal health and zoonoses, and the International Plant Protection Convention for plant health. Their standards are the benchmark. A separate WTO agreement, the Agreement on Technical Barriers to Trade (TBT), covers technical regulations that are not SPS measures, such as most labelling of quality or composition.
The SPS Agreement does not tell countries what level of protection to choose. It accepts each member's right to set its own appropriate level of sanitary protection (ALOP), and disciplines how it gets there: with science, consistency and the least trade-restrictive measure that achieves that level.
Article 2 sets basic rights and obligations: members may take SPS measures necessary to protect life or health, but must base them on scientific principles, not maintain them without sufficient scientific evidence (except as allowed by Article 5.7), and not use them to discriminate arbitrarily or as a disguised restriction on trade. Article 3 is harmonisation: measures should be based on international standards; measures that conform to them are presumed to be consistent with the Agreement; a member may introduce a higher level of protection if there is scientific justification or if it follows from the member's chosen level of protection under Article 5. Article 4 is equivalence: an importing member must accept another member's different measures as equivalent if the exporter objectively shows they achieve the importer's level of protection.
Article 5 deals with risk assessment and the appropriate level of protection. Measures must be based on an assessment of risk, taking into account the techniques of the relevant international organisations. Members should avoid arbitrary or unjustifiable distinctions in the levels of protection they apply in different situations if those distinctions cause discrimination or disguised restriction (Article 5.5), and should ensure measures are not more trade-restrictive than required (Article 5.6). Article 5.7 allows provisional measures where scientific evidence is insufficient, on the basis of available information, provided the member seeks additional information and reviews the measure within a reasonable time.
Article 6 requires members to adapt measures to the regional SPS characteristics of the areas of origin and destination, and to recognise pest- or disease-free areas and areas of low prevalence. Article 7 and Annex B require transparency: publication of regulations, notification of new measures to the WTO, and an enquiry point. Article 12 establishes the SPS Committee. Disputes go to the WTO dispute settlement system, where panels may consult scientific experts.
A few disputes are standard teaching cases. In EC — Hormones, the United States and Canada challenged the European Communities' ban on meat from cattle treated with certain growth-promoting hormones; the Appellate Body found in 1998 that the ban was not based on a risk assessment as Article 5.1 requires. In Australia — Salmon, Canada challenged Australia's import ban on uncooked salmon; the measure was found to be inconsistent with Article 5, including because Australia applied a stricter regime to salmon than to comparable risks from other fish. In India — Agricultural Products, the United States challenged India's ban, justified by avian influenza, on imports of poultry products from countries reporting notifiable avian influenza; the panel (2014) and the Appellate Body (2015) found the measures inconsistent with the Agreement, including because they were not based on the relevant WOAH standard or a risk assessment and did not recognise disease-free zones as Article 6 requires.
The lessons for a Veterinary Service are practical. Base import conditions on the WOAH Code or a documented risk analysis. Recognise zones and compartments in exporting countries when they meet the Code. Be consistent between similar commodities. Notify new measures through the WTO and answer enquiries. When an emergency forces a measure without full evidence, frame it as provisional under Article 5.7 and review it. And, as an exporter, report honestly: the Agreement protects members whose own systems are transparent and credible.
WOAH was created in 1924 as the Office International des Epizooties after rinderpest reached Europe through cattle shipped via Antwerp; it adopted the name World Organisation for Animal Health in 2003 and the acronym WOAH in 2022, with its headquarters in Paris. It has more than 180 Members. The World Assembly of Delegates, meeting each year in May, is the governing body; each Member has one Delegate, usually the CVO, and one vote. Standards are adopted by the Assembly after drafts have passed through the specialist commissions and rounds of comment by Members.
There are four specialist commissions. The Terrestrial Animal Health Standards Commission drafts the Terrestrial Code. The Aquatic Animal Health Standards Commission drafts the Aquatic Code and Aquatic Manual. The Scientific Commission for Animal Diseases advises on disease control and assesses applications for official disease status. The Biological Standards Commission oversees the Terrestrial Manual, reference laboratories and vaccine standards.
WOAH publishes four normative texts: the Terrestrial Animal Health Code, the Aquatic Animal Health Code, the Manual of Diagnostic Tests and Vaccines for Terrestrial Animals (the Terrestrial Manual), and the Manual of Diagnostic Tests for Aquatic Animals (the Aquatic Manual). The Codes set standards for safe trade, surveillance, control and welfare; the Manuals set laboratory standards for tests and vaccines. All are revised every year, so a practitioner must check the current edition, freely available on the WOAH website.
The Terrestrial Code is published in two volumes. Volume I holds the horizontal standards that apply across diseases: diagnosis, surveillance and notification; risk analysis; quality of Veterinary Services; disease prevention and control, including zoning, compartmentalisation, identification and traceability, and disinfection; trade measures, import and export procedures and veterinary certification; veterinary public health, including antimicrobial use; and animal welfare. Volume II holds the disease-specific chapters, arranged by multiple species and then by host group: cattle, sheep and goats, horses, pigs, birds, bees, lagomorphs and camelids.
A typical disease chapter gives the purpose and definitions, including the infective or incubation period used in trade; lists safe commodities that can be traded whatever the health status of the source because processing or the nature of the commodity removes the risk; sets conditions for a country, zone or compartment to be free, with or without vaccination where relevant; sets conditions for recovery of free status after an outbreak; recommends import conditions for each commodity from free and infected sources; and gives surveillance requirements and inactivation procedures.
The Aquatic Code follows the same logic for amphibians, crustaceans, fish and molluscs, with its own list of diseases and with attention to the special problems of water-borne spread, wild aquatic animals and the trade in live animals for ornamental use and aquaculture. The aquatic animal health subject covers those diseases; this subject uses the Aquatic Code mainly for its horizontal chapters on notification, risk analysis, certification and zoning.
WOAH officially recognises the disease status of Members, or zones or compartments within them, for six diseases: foot-and-mouth disease, contagious bovine pleuropneumonia, bovine spongiform encephalopathy (as negligible or controlled risk), African horse sickness, peste des petits ruminants and classical swine fever. It also endorses official control programmes for FMD, CBPP and PPR, and for dog-mediated rabies. For all other diseases, Members may make a self-declaration of freedom that WOAH publishes on the Member's responsibility.
Recognition is granted by the World Assembly on the advice of the Scientific Commission after a dossier is assessed, and must be confirmed every year by annual reconfirmation. Status is suspended if an outbreak occurs, and the disease chapter then sets the waiting period before recovery. For FMD, for example, the Code sets shorter recovery periods when stamping out is used without vaccination, or with emergency vaccination followed by slaughter of vaccinated animals, than when emergency vaccination is used and vaccinated animals are kept alive; the latter path also needs surveillance showing no evidence of infection in vaccinated animals. Check the current edition for exact periods.
Official recognition matters for trade because importing countries usually accept it as evidence, and because it is the endpoint of national eradication programmes. India, for example, has announced plans for FMD-free zones and has self-declared freedom from avian influenza in specified poultry compartments. The rinderpest campaign, ending in global eradication declared in 2011, used the same process of country-by-country recognition.
An emergency animal disease is an outbreak of a transboundary, emerging or exotic disease that needs a rapid response because of its potential to spread or cause harm. The response is only as good as the preparation. FAO's Good Emergency Management Practice describes the cycle of prevention, preparedness, response and recovery. A national contingency plan sets out the legal powers, chain of command, funding, roles of each agency, and disease-specific strategies; it is backed by operational manuals for tasks such as valuation, killing, disposal, cleaning and disinfection, and by exercises that test it.
Command structures are usually tiered. A national disease control centre sets policy and allocates resources; local disease control centres run field operations near the outbreak, with teams for surveillance, tracing, valuation, killing and disposal, cleaning and disinfection, logistics, and public communication. Many countries use an incident command system borrowed from civil emergency services. Australia's AUSVETPLAN gives agreed response strategies, and its Emergency Animal Disease Response Agreement sets out how governments and livestock industries share response costs. In the EU, member states must keep contingency plans under the Animal Health Law.
Preparedness also needs stockpiles or rapid access to vaccines (for instance through vaccine banks), diagnostic capacity in reference laboratories, trained staff and paraprofessionals who can be mobilised, disposal sites identified in advance with environmental agreement, and simulation exercises. Lessons from the 2001 FMD epidemic in the United Kingdom, in which several million animals were killed, and from repeated HPAI and African swine fever epidemics, all point to speed of detection and the first days of response as decisive.
Stamping out, in WOAH terms, means killing animals that are affected and those suspected of being affected in the herd and, where appropriate, those in other herds that have been exposed to infection by direct contact or indirect contact that could transmit the agent, followed by disposal of carcasses and, where relevant, products, and cleaning and disinfection. Modified stamping out describes cases where not all susceptible animals in contact are killed, for example where vaccination is used alongside culling. Pre-emptive culling of contiguous premises or dangerous contacts may be added when spread outruns detection.
Killing for disease control must follow the welfare standards in the Code: trained staff, suitable methods for the species and age, and confirmation of death; methods include captive bolt, electrical methods, injection of barbiturates or other agents, and gas methods for poultry such as carbon dioxide or foam, used under the conditions the Code sets out. The welfare and the mental health of farmers and staff during mass culling are now part of planning.
Carcass disposal options include rendering, on-site or off-site burial, burning by open pyre or incineration, composting and alkaline hydrolysis. The choice depends on the agent (prions need special treatment), the volume, the water table and environmental law, biosecurity during transport, and public acceptance. Cleaning and disinfection of premises uses disinfectants known to be effective against the agent, such as acids or alkalis for FMD virus, which is sensitive to pH outside a narrow neutral range.
Compensation pays owners for animals and products destroyed under official order. Its purpose is not charity but disease control: owners who expect fair, prompt payment report early, and early reporting is the single largest determinant of outbreak size. Compensation is usually based on market value at the time of killing, assessed by an independent valuer or by a published table, sometimes with a reduced rate when an owner has breached biosecurity rules or reported late. Poorly set compensation creates perverse incentives: too low, and owners hide disease or sell sick animals; too high, and owners may be careless or even introduce infection. Whether compensation covers consequential losses, such as lost production during restriction, differs between countries.
Vaccination in an emergency can be suppressive or protective. Suppressive vaccination is applied inside a known infected area to reduce virus production and spread, usually followed by culling of the vaccinated animals (vaccinate-to-kill). Protective vaccination is applied outside the infected area to create a buffer of immune animals (vaccinate-to-live). Ring vaccination vaccinates all susceptible animals in a ring around an outbreak, either from the infected premises outward or as a band between an inner and outer radius, so that the infection meets an immune population. Rinderpest eradication, smallpox eradication in people, and many FMD responses have used ring strategies.
Vaccines that allow differentiation of infected from vaccinated animals (DIVA), such as FMD vaccines purified of non-structural proteins used with an NSP antibody test, make vaccinate-to-live compatible with demonstrating freedom. The choice of strategy weighs speed, vaccine supply, labour, public acceptance of culling, and the trade cost of a longer recovery period.
India has the world's largest livestock population and has long carried endemic foot-and-mouth disease and brucellosis. The National Animal Disease Control Programme for FMD and brucellosis was launched in September 2019 as a centrally funded scheme, with the centre bearing the full cost of vaccine, vaccination and associated activities, and an outlay of about Rs 13,343 crore for the first five years. Its aim was to control both diseases by 2025 and to eradicate them by 2030.
Under NADCP, cattle, buffaloes, sheep, goats and pigs are vaccinated against FMD every six months. Female bovine calves aged four to eight months are vaccinated once in their lifetime against brucellosis, using the live strain 19 vaccine. Animals vaccinated are identified with 12-digit ear tags and recorded with vaccination details on the national livestock database, and serosurveillance and sero-monitoring by ICAR institutes and state laboratories check coverage and immunity. The programme's practical problems are those of any mass campaign: cold chain to remote villages, staff time, owners' reluctance to vaccinate pregnant or high-yielding animals, and tag losses.
From 2021-22 the Government of India restructured its livestock health schemes into the Livestock Health and Disease Control Programme. Its main components are the Critical Animal Disease Control Programme, which brings NADCP together with eradication of peste des petits ruminants and control of classical swine fever; the Establishment and Strengthening of Veterinary Hospitals and Dispensaries, which includes mobile veterinary units reached through a toll-free number; and Assistance to States for Control of Animal Diseases (ASCAD). Scheme names and components change with budget cycles, so the current guidelines from the Department of Animal Husbandry and Dairying should be checked.
ASCAD is the component through which the centre helps states control economically important and zoonotic livestock and poultry diseases that are not covered by the fully centrally funded campaigns. It supports vaccination against diseases chosen by each state according to its disease pattern, such as haemorrhagic septicaemia, black quarter, enterotoxaemia, anthrax, lumpy skin disease, Ranikhet (Newcastle) disease, infectious bursal disease and rabies. It also funds strengthening of state disease diagnostic laboratories, training of veterinarians and paraprofessionals, disease surveillance, and the payment of compensation to farmers for animals and birds culled under official control, for example during avian influenza outbreaks.
ASCAD is a centrally sponsored scheme with cost sharing. In general the centre and states share costs in the ratio 60:40; for north-eastern and Himalayan states the ratio is 90:10; and union territories receive full central funding. A state animal husbandry department prepares an annual action plan, often based on its own disease forecasting and seasonal calendar, and draws funds against it. For a state veterinary officer, ASCAD is the scheme that pays for routine pre-monsoon HS and BQ vaccination, for bird-flu compensation and for laboratory reagents, so knowing its rules is part of the job.
ICAR-NIVEDI in Bengaluru runs the National Animal Disease Referral Expert System, which issues advance disease forecasts by district for major livestock diseases. States use such forecasts to time vaccination campaigns under ASCAD before the expected high-risk season.
The National Agricultural Higher Education Project (NAHEP) is not a disease-control programme. It is an Indian Council of Agricultural Research project, supported by the World Bank on a cost-sharing basis and started in 2017-18, to improve the quality and relevance of higher education in agricultural universities, including veterinary universities and colleges. Its activities included institutional development plans for universities, centres for advanced agricultural science and technology, faculty training, international exposure for students, and support for digital learning and governance. For a veterinary student or teacher, NAHEP explains many new laboratories, skills centres and exchange programmes; for a state veterinary officer, it matters chiefly through the training and research capacity it built.
The legal frame for Indian state veterinary work rests on a few acts. The Prevention and Control of Infectious and Contagious Diseases in Animals Act, 2009 gives powers to notify scheduled diseases, declare controlled areas, restrict movement, order vaccination, isolate, and destroy animals, and requires reporting. The Livestock Importation Act, 1898 governs imports of livestock and livestock products, with the Department of Animal Husbandry and Dairying issuing sanitary import permits for products. Animal husbandry is a state subject under the Constitution, so implementation lies with state departments while the centre sets national programmes and international obligations.
Learn the vocabulary exactly: Veterinary Authority, Official Veterinarian, zone, compartment, stamping out, entry assessment, ALOP. Exams ask for definitions and for the order of steps, such as the components of import risk analysis or the triggers for 24-hour notification to WOAH. Practise the two calculations that recur: the probability that a consignment contains an infected animal, and the sample size to demonstrate freedom. If you are Indian, know the NADCP schedule and the ASCAD funding ratio; if you are elsewhere, read your own country's notifiable list and the agency that receives reports.
A practitioner five years out is the first person to suspect a notifiable disease on a farm. Know your national list and the number to call, stop movements from the premises while you wait, take the samples the authority asks for, and keep records that support tracing. If you are accredited to sign certificates, apply the rule that you certify only what you know or what an authorised party has ascertained, never sign blanks, and refuse when the evidence is missing. In a state post, you will run vaccination campaigns, write movement permits and handle the first visit to a suspect outbreak; follow the contingency plan, record everything and communicate with owners about compensation honestly.
A senior state veterinarian manages systems: budgets for vaccination and compensation, the laboratory network, border posts, and the contingency plan. Use the PVS Tool critical competencies to set priorities and argue for resources. Negotiate bilateral export certificates on the basis of WOAH standards, and insist on recognition of zones and compartments. In an emergency, lead the command structure, decide between stamping out and vaccination strategies with an eye on recovery periods and trade, and protect the independence of officers from political and commercial pressure. Commission regular simulation exercises and act on what they reveal.
A researcher at this level shapes policy: quantitative import risk assessments, models of spread and control in networks of animal movements, economic analysis of vaccination versus culling and of compensation design, and evaluation of surveillance systems for demonstrating freedom. Key open questions include how to value trust and reporting behaviour, how to recognise zones faster under the SPS Agreement, how to integrate traceability data into real-time models, and how to design DIVA-based exit strategies. Publish methods transparently, state uncertainty, and work with WOAH ad hoc groups and national authorities so models answer decisions actually being made.
This manual describes national law in general terms and by example; it does not reproduce any country's full notifiable-disease list, quarantine periods, standstill durations, compensation rates or fee schedules, which change often and must be checked on the official national site. Chapter numbers of the WOAH Codes are given only where they have been stable across editions, and recovery periods for disease status are described in principle rather than quoted. Indian scheme names, outlays and components change with each budget cycle; the figures given are those announced at launch. Livestock census figures are given only for India's 20th census. It does not cover aquatic diseases one by one, detailed meat inspection, residue limits, professional regulation, forensic work, or AMR policy, which belong to other subjects, and it does not yet cover veterinary administration in francophone Africa, Latin American regional bodies (such as OIRSA or the regional animal-health committees) or the economics of veterinary services in depth.
Original practice questions written to the syllabus and pattern of the exams named in each question's examTags. They are not past papers and do not reproduce any board's questions.
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