A 3-month old calf was submitted for necropsy to the Oklahoma Animal Disease Diagnostic Laboratory. The calf was found lying down 2 days before dying. During necropsy examination, the body presented moderate emaciation and anemia. The cecal and colonic contents were pasty with numerous parasites 1 to 1.5 cm long. (Image 1)
Image 1: Parasites found in cecal and colonic contents
Oesophagostomins are parasites of the large intestine of ruminants, swine and primates. The adults are 1 to 2 cm long and the eggs are 70 to 90 x 34 to 45 um. They are also called nodular worms because their larva can become encapsulated by a reactive inflammation in hypersensitive hosts. Acute inflammation may lead to diarrhea that can be fatal.
This calf also had high numbers of Moniezia sp. eggs, and Nematodirus helvetianus, with the last one being pathogenic in young animals that have no acquired immunity. (Image 2)
Image 2: Fecal centrifugation from small intestinal content
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