Laboratory rodents often harbor pinworms, i.e., ascarids of the family oxyuridae. In rodents, the most common species are Syphacia and Aspiculuris. S. obvelata is the most common in mice; S. muris is the most common in rats, while hamsters may occasionally harbor a third species, S. mesocriceti. In mice, Aspiculuris tetraptera is nearly as common as Syphacia spp. Up to 70% of U.S. laboratory animal facilities have recently been shown to carry pinworm infestations.35 In rabbits, the most common species is Passalurus ambiguus. Pinworms live in the free lumen of the caecum, colon, and rectum. They are extremely infectious, as they easily spread with staff, equipment, etc., and the infectious dose is rather low. Clinical symptoms are rare. Diagnosis is, if not simply observing the worms during necropsy, made by detecting eggs in the tape or flotation test.
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