The chimpanzee pinworm, Enterobius anthropopitheci (Gedoelst, 1916), was found in chimpanzees, Pan troglodytes, reared in Kumamoto Primate Research Park, Sanwa Kagaku Kenkyusho Co., Ltd., Kumamoto, Japan, in 2006. Because the chimpanzees in this institution originated from chimpanzees imported from Africa before 1984, it is considered that E. anthropopitheci infection has persisted for more than 20 yr in the chimpanzees. Analysis of pinworm specimens preserved in the institution revealed that transition of predominant pinworm species occurred, responding to the change of anthelmintics used for pinworm treatment. Present dominance of E. anthropopitheci is surmised to be caused by fenbendazole, which has been adopted from 2002. Scarcity of mixed infection with E. anthropopitheci and Enterobius vermicularis suggests interspecific competition between the pinworms.
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