Also known as: OPA、綿羊肺腺瘤病
綿羊肺腺癌(OPA),舊稱綿羊肺腺瘤病,是由綿羊肺腺瘤病反轉錄病毒引起的綿羊傳染性肺腫瘤。該病毒會轉化肺部分泌細胞,產生緩慢增大的腺癌並伴隨大量液體積聚。患病綿羊會出現進行性消瘦、運動不耐受及大量水樣鼻液,典型可透過「手推車測試」驗證。本病幾乎無一例外地致命,並透過呼吸道分泌物在羊群中傳播。
Ovine pulmonary adenocarcinoma is a transmissible lung cancer of sheep caused by a retrovirus. It is a chronic, fatal wasting disease and an important cause of respiratory loss in flocks.
The jaagsiekte sheep retrovirus infects and transforms lung secretory cells, producing tumours. Transmission is mainly by inhalation of infectious respiratory fluid, often during close housing.
Affected sheep show gradual weight loss, increased respiratory effort, exercise intolerance, and abundant thin watery nasal fluid. Lowering the head can pour fluid from the nostrils (wheelbarrow test).
Clinical signs, the wheelbarrow test, and ultrasound of the chest support diagnosis; confirmation is by post-mortem examination and PCR for the virus, as there is no reliable blood test.
There is no cure. Affected animals should be culled to reduce spread and relieve suffering.
Control relies on culling clinical cases, sourcing replacements from low-risk flocks, reducing prolonged close housing, and ultrasound screening in valuable flocks.
This content is for educational purposes and is not a substitute for professional veterinary advice. If you are worried about your pet, contact your veterinarian.
