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A 3-year-old male hamadryas baboon (Papio hamadryas) at the Seoul Zoo, Korea, died without any previous symptoms. Necropsy revealed severe whipworm infection in the large intestine. The animal weighed 2.6 kg and had a blood clot at the anus. Numerous whipworms were found attached to the intestinal wall, with their anterior ends embedded in the mucosa. Fecal microscopy revealed typical barrel-shaped, brown eggs of Trichuris spp., with hyaline polar plugs at each end. Histopathological examination revealed the thin anterior part of Trichuris spp. embedded in the mucosal layer and the thick posterior part at the mucosal surface or hanging freely in the intestinal lumen. This case emphasizes the importance of parasitic infection management in zoo animals.

Severe whipworm (Trichuris spp.) infection in the hamadryas baboon (Papio hamadryas)