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American Journal of Epidemiology Vol. 106, No. 2: 167-171
Copyright © 1977 by The Johns Hopkins University School of Hygiene and Public Health

other

TRICHINOSIS IN BEARS OF WESTERN AND NORTHCENTRAL UNITED STATES

W. J. ZIMMERMANN

Veterinary Medical Research Institute, College of Veterinary Medicine, Iowa State University Ames, IA 50011

Zimmermann, W. J. (Veterinary Medical Research institute, Iowa State U., Ames, IA 50011). Trichinosis in bears of western and northcentral United States. Am J Epidemiol 106:167–171, 1977.

Black bears (Ursus americanus) from 10 states were examined for Trichinella spiralis during the 1970–1975 period. Trichinae were found in 14 (3.1%) of 454 bears examined. Infected bears were found from California, seven (13.2%) of 54; Idaho, one (2.3%) of 44; and Wisconsin, six (3.8%) of 163. Trichina counts per gram of tissue obtained by the artificial digestion-Baermann method ranged from 1390 to 0.02. Six California bears and one from Wisconsin contained more than one trichina per gram, a level considered capable of inducing clinical trichinosis in man.

bears; Trichinella; trichinosis


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