Iceburg Diseases in Sheep - Ovine Pulmonary Adenocarcinoma (OPA)

Ovine Pulmonary Adenocarcinoma (OPA), also known as Jaagsiekte, is an infectious lung cancer of sheep and goats found worldwide apart from Australia and New Zealand. It is classed as one of the “iceberg diseases” of sheep. The extent of the problem within a flock can be underestimated because visibly diseased sheep are usually just the tip of the problem.