Posts Tagged: OPA

Rigorous measures needed for control of OPA

sheep

Ovine pulmonary adenocarcinoma (OPA) is an infective lung tumour caused by the Jaagsiekte virus. It can be difficult to diagnose and has no treatment, making it a challenge to control once it takes hold within a flock. The virus is mostly spread by secretions from the nose and mouth but can also be passed from… Read more »