An epidemiological study of helminthiasis in cattle in subtropical Argentina.

摘要: Nine farms were each visited regularly for a year in 1979 and 1980 Salta Province the subtropics of Argentina. A necropsy was done at visit faecal blood samples taken from other animals mostly aged between 6 18 months. Ninety necropsies nearly 1,500 collected. Gastro-intestinal helminthiasis most general severe autumn when calves about 9 months old this followed by dramatic fall numbers worms end winter. Helminths found organs but not considered important. At peak periods 20% had worm egg counts more than 750 epg contained 1,000Haemonchus worms. This species to be important frequently encountered wereOesophagostomum, Cooperia andTrichostrongylus spp. list is given all found. Tracer used determine infestation. No hypobiosis encountered. It concluded that sharp after due development immunity majority young animals.