Forty-six heads of free-ranging black bears (Ursus americanus) collected in May and June of 1995 and 1996 from Oregon (USA) were examined for the trematode Prouterina wescotti and other parasites. Only Sarcocystis sp. was detected in two adult male bears. Prouterina wescotti has been found only once previously in one black bear from Idaho (USA); its normal definitive host remains unknown.
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Foreyt et al. (1999) studied this question.
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