广义的包虫病在整个阿拉斯加各土居民族中流行。包囊性包虫病(由细粒棘球蚴引起的北方森林型)在那里广泛存在,但其发病率很低(不象致病性更强的多节绦虫引起的欧洲畜牧型那样)。含有可见包囊的肺部感染通常无症状。阿拉斯加的患者约85%的肝脏病例存在钙化的包囊,这些人很少产生症状亦无需治疗,我们认为这些钙化病损中的 Echinococcosis is widespread in all Alaskan natives. Cystic echinococcosis (a northern forest type caused by Echinococcus granulosus) is widespread there, but its incidence is very low (unlike the European herd-producing species caused by the more pathogenic tapeworms). Pulmonary infections with visible cysts are usually asymptomatic. About 85% of Alaskan patients have calcified cysts in their liver cases, and these people have very little symptoms and do not need treatment. We think of these calcified lesions