| prevalence of trichinella spiralis in black bears (ursus americanus) from newfoundland and labrador, canada. | tongue and diaphragm samples from 158 black bears (ursus americanus) from newfoundland and labrador were examined for trichinella spiralis. no larvae were detected in samples from the island of newfoundland but one animal from the labrador samples was infected. the results of this and other studies suggest a lack of involvement of the black bear in a sylvatic cycle of t. spiralis in eastern canada. | 1992 | 1512886 |