Читать книгу Farm Animal Medicine and Surgery - Graham R Duncanson - Страница 115

In the UK, this condition is caused by Fasciola hepatica (the liver fluke). F. gigantica is found in Africa and Asia. The intermediate host in the UK is Lymnaea truncatula (the water snail). The normal form of the disease in cattle is chronic, with most of the flukes shed within 6 months, leaving the bile ducts irreparably thickened and even calcified. The principal signs are weight loss and diarrhoea, with raised liver enzymes. Diagnosis can be confirmed on a blood test with an ELISA. Eggs may be seen in the faeces and these are diagnostic but often, even in bad cases, eggs are not found. Treatment is with oral triclabendazole which kills adults and immature stages, clorsulon both by injection and as a pour on, and albendazole which only kills the adults.