Sudden deaths in a goat flock after market purchase
A semi-intensive goat farm in Solapur holds 60 Tellicherry goats, including 18 pregnant does. In 48 hours three goats died after 24 to 36 hours of fever around 41.5°C, nasal discharge, mouth erosions and watery diarrhoea; one more is recumbent with laboured breathing. The owner added 12 goats from a weekly market 10 days ago without quarantine. The last vaccination was a single dose of PPR vaccine two years ago. The goats graze on harvested sorghum stubble and receive 300 g concentrate. The local veterinarian suspects pneumonia and has started oxytetracycline in the drinking water. Two goats have swollen lips, and a shared water trough serves all animals. There is no post-mortem facility nearby. The owner wants to sell the remaining goats immediately before prices fall further.
1. Rank the likely differential diagnoses and explain what in the setup supports or weakens each one.
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PPR should be ranked first: fever, nasal discharge, oral erosions, diarrhoea and deaths in unquarantined newly purchased goats fit the syndrome, and the single vaccination two years ago does not guarantee flock immunity. Pasteurellosis is a reasonable second differential because of the laboured breathing and sudden deaths, but it less often causes mouth erosions and watery diarrhoea in several animals at once. Enterotoxaemia can kill quickly, but the fever and oral lesions are less typical and it usually follows a sudden concentrate change rather than a market purchase. Orf would explain swollen lips and erosions but not the high fever and diarrhoea. The shared trough supports a contagious viral disease. The key judgement is not to wait for a laboratory result before isolating and restricting movement; the pneumonia label is incomplete because it does not explain the full syndrome.
2. What immediate control measures would you advise, and how would you handle the antibiotic already being given in drinking water?
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Isolate the recumbent goat and any animal with fever or lesions, and stop all movement of goats and people between pens. Do not sell or transport animals during the outbreak. Notify the veterinary authority and arrange post-mortem of a fresh carcass if possible, with samples for PPR confirmation. Dispose of carcasses by deep burial with lime, not by opening them near the shed. Clean and disinfect the trough, feeders and footwear, and provide separate water buckets. Vaccinate the apparently healthy goats around the affected group only after veterinary advice, because vaccinating incubating animals can worsen losses. Stop oxytetracycline in the communal drinking water: dosing is uncontrolled, it may mask cases and promote resistance. Treat individual sick goats with veterinary supervision, including supportive fluids and an antibiotic only for secondary bacterial infection. Protect pregnant does from handling stress and give good-quality hay and clean water.
3. Evaluate the owner's plan to sell the flock immediately and suggest a better economic and extension response.
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Immediate sale is risky and likely to spread infection, depress local prices and break buyer trust. If PPR is confirmed, animals in the incubation period can carry infection to the buyer's flock, and the owner may face movement restrictions. A better response is to ring-vaccinate, cull only animals with no realistic chance of recovery under veterinary advice, and hold the rest for 21 to 30 days. The economic loss from three deaths is already sunk; selling 57 goats at a panic price may lose more than the cost of vaccination, supportive care and feed. The extension message should be quarantine of new goats for 21 days, annual PPR vaccination, a closed water system and record keeping. The owner should calculate the cost of one vaccine dose per goat against the value of a doe, and seek compensation or insurance only through proper veterinary certification.