Date of this Version
Cysticercosis in a canine host (Canis jamiliaris) attributable to the taeniid cestode Taenia crassiceps is reported for the first time in North America. Numerous parent and daughter cysticerci occurred in a massive intrapleural and intraperitoneal infection in an apparently immunocompromised host. The largest cysticerci were ovoid to elongate. 5-9 mm in maximum length. and armed with 32-34 rostellar hooks in two rows; small hooks measured 114-143 μm long (avg. = 124 ± 8.2 μm). and large hooks were 156-180 μm (avg. = 163 ± 7.4 μm). Taenia crassiceps is widespread in boreal North America and, like a number of other taeniids, constitutes a potential risk as a zoonotic parasite. The immunological status of the host may be important in determining the outcome of infections for this and other taeniids in atypical hosts.