The KwaZulu-Natal Nature Conservation Board held a game auction in June 1998 at which buffalo were sold and described as disease-free, meaning free of corridor disease. Sinoville (Pty) Ltd purchased six buffalo at a high price on the strength of this representation. The buffalo originated from conservation reserves ultimately linked to Addo buffalo, which were generally regarded as disease-free, but they had been kept in areas where brown ear ticks, which transmit corridor disease, were present. Sinoville later placed the buffalo on Tangeni Boerdery’s farm under a written agreement. The buffalo transmitted corridor disease to Tangeni’s cattle, causing extensive losses, and the buffalo were destroyed. Subsequent pathological testing revealed that the buffalo were in fact infected. Tangeni sued the Board for negligent misrepresentation and Sinoville for breach of an alleged tacit term that the buffalo would be disease-free. Sinoville sued the Board for negligent misrepresentation, alternatively for repayment of the purchase price based on common mistake. The trial court dismissed the delictual claims but held the sale between the Board and Sinoville void due to common mistake, ordering repayment of the purchase price. Multiple appeals followed.