Identification of helminths in ruminants at necropsy

The shortcomings of faecal worm egg counts as a method of diagnosis are discussed. The best method of making a diagnosis of helminthosis is a necropsy. The equipment necessary and technique of carrying out an autopsy are described in detail. Emphasis is laid on the common nematodes which inhabit the gastro-intestinal tract and their relative sizes are illustrated. A brief description of the common nematodes, cestodes and trematodes of domestic ruminants adequate for a preliminary diagnosis is given in tabular form. Full host parasite lists and the number of worms of the most common species necessary to cause clinical signs and even death are tabulated. Emphasis is laid on microscopical examination to recover and diagnose helminths.