Trematodes of the genus Cotylophoron cause mucosal lesions in pre-stomachs and in small intestine in cattle, generating losses in animal production. In the Northeastern Peruvian Amazon, the presence of Cotylophoron panamensis in the 16.7% (4/24) in free-living red brocket deers (Mazama americana) in areas distant from livestock farming suggests the red brocket is a natural wild host of C. panamensis.
Keywords: Cotylophoron; Mazama americana; Peruvian Amazon.
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