Detection and differentiation of trichuris in giraffe (giraffa camelopardalis) under human care
2022
Shusterman, Lauren | Marsh, Antoinette E. | Joyner, Priscilla H.
Trichuris spp. are nematode parasites infecting many species, including domestic and wild ruminants in zoological and wildlife parks worldwide. These nematodes cause significant morbidity in giraffes (Giraffa camelopardalis) and other hoofstock. Parasite transmission between ruminant species is well reported; however, relative to domestic species, little is known about Trichuris infections in giraffes under human care. We hypothesized that Trichuris spp. differ between individual giraffes in different US regions, suggesting giraffes are susceptible to Trichuris from other ruminant hosts. The study sites used to assess this hypothesis included The Wilds in Cumberland, Ohio; Fossil Rim Wildlife Center in Glen Rose, Texas; White Oak Conservation in Yulee, Florida; and Binder Park Zoo in Battle Creek, Michigan. Trichuris eggs were collected from the feces of 14 individual giraffes located at the four different study sites and from soil samples from the enclosures where Trichuris-positive giraffes were housed. The eggs were isolated and their genes were amplified by PCR and compared at the molecular level. Trichuris samples from four giraffe hosts and one soil site were sequenced and portions of the cox1 and 18S genes compared. This study found that >12 eggs per gram of fecal-derived Trichuris eggs must be present to amplify Trichuris-specific DNA. The Trichuris spp. found in the majority of giraffes in this study were most similar to T. ovis and T. discolor, and one giraffe sample had greater similarity to T. skrjabini and T. leporis.
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