Australasian Veterinary Examination (AVE), formerly the National Veterinary Examination (NVE) · Australia / New Zealand · Australasian Veterinary Boards Council (AVBC)
Original practice questions written to the published syllabus · not past papersThe bacterial and related infectious diseases of livestock and horses: clinical signs, diagnosis, treatment, prevention and control.
In the exams: ICAR AICE-JRF core group 07 (Medicine); ICAR AIEEA-PG 13; China infectious diseases 30; TNPSC Micro/VPH/Preventive Medicine 30
How our questions for Australasian Veterinary Examination, formerly the National Veterinary Examination spread across the units of Preventive Veterinary Medicine I: Bacterial, Fungal, Rickettsial and Mycoplasmal Diseases. Difficulty: 7 easy, 14 medium, 8 hard.
| Mastitis | 7 | |
| Clostridial diseases: black quarter, enterotoxaemia and tetanus | 4 | |
| Strangles | 3 | |
| Caseous lymphadenitis | 3 | |
| Anaplasmosis | 3 | |
| Listeriosis | 2 | |
| Johne's disease | 2 | |
| Actinomycosis and actinobacillosis | 2 | |
| Leptospirosis | 1 | |
| Brucellosis | 1 | |
| Ringworm | 1 |
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
A 50-cow herd: 40 cows give 20 kg/day at 150,000 cells/mL, 8 cows give 15 kg/day at 900,000 cells/mL, and 2 cows give 10 kg/day at 3,000,000 cells/mL. What is the expected bulk-tank SCC?
D. About 306,000 cells/mL
Bulk SCC is weighted by milk yield: (800 kg x 150,000 + 120 kg x 900,000 + 20 kg x 3,000,000) / 940 kg = 288,000,000 / 940 = 306,383 cells/mL (kg of milk is treated as litres, which is close enough for this estimate). The unweighted cow average (384,000) ignores that high-SCC cows give less milk; 1,350,000 is the mean of the three group values; 248,000 is the result after the two worst cows are removed.
Strangles in horses is caused by:
D. Streptococcus equi subsp. equi
S. equi subsp. equi, a Lancefield group C beta-haemolytic streptococcus, causes strangles. Subsp. zooepidemicus is a related opportunist of the equine respiratory tract and is the tempting distractor; Rhodococcus equi causes foal pneumonia.
Which species is most sensitive to tetanus toxin?
B. Horse
Horses (and humans) are highly sensitive; dogs and cats are relatively resistant and often show localised tetanus, and birds are highly resistant.
An unvaccinated horse has a deep puncture wound of the hoof. The recommended tetanus prophylaxis is:
A. Tetanus antitoxin plus a first toxoid dose at a separate site, then completing the course
Toxoid takes weeks to induce immunity, so an unvaccinated horse needs antitoxin for immediate passive protection, with toxoid at a separate site to begin active immunity. Penicillin kills the organism but does not neutralise toxin already formed.
A five-year-old cow has had persistent diarrhoea and weight loss for two months, with normal appetite, no fever and submandibular oedema. The most likely diagnosis is:
B. Johne's disease
Chronic diarrhoea without fever and with good appetite, progressive weight loss and bottle jaw in an adult cow are classic for clinical Johne's disease. Salmonellosis is usually febrile and acute; winter dysentery is an acute herd outbreak.
A horse with suspected tetanus shows which sign when its head is raised or its face tapped?
B. Third-eyelid prolapse
Retraction of the eyeball by spastic muscles pushes the third eyelid across the eye, a classic early sign. Head tilt and nystagmus suggest vestibular disease.
Ten here, 29 in the app. The Laisha app has every practice question we have written to Australasian Veterinary Examination, formerly the National Veterinary Examination in this subject, marked as you go, with timed papers, a jump-to-unanswered list and a certificate when you pass at 70 per cent.
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