Prevalence among foxes in Germany and Lithuania is high 24% and 26.4%, respectively. In contrast, prevalence in Denmark is low, only 0.2%. Although humans rarely serve as intermediate hosts, an increasing number of zoonotic infections have emerged in recent years. Infection of humans is thought to occur after consumption of food or water contaminated with infective ova shed in carnivore feces. All recognized cases involving the muscles or subcutis of humans have been associated with underlying immunosuppression, except for 1 case.