| studies on sylvatic echinococcosis. v. factors influencing prevalence of echinococcus multilocularis leuckart 1863, in red foxes from north dakota, 1965--1972. | a total of 1,153 red foxes, vulpes vulpes, was examined for strobilae of echinococcus multilocularis from 2 geographic regions in north dakota during 1965 through 1972. echinococcus multilocularis was found in 184 (16%) of these foxes. the data including date and location of collection, age and sex of the host, and presence or absence of the cestode were used to assess the relative influence of collection interval (sampling period), climatic season, geographic location, and age and sex of the ho ... | 1978 | 682065 |