For medical scientists, biologists and geographers interest- ed in geomedical problems the helminthiases can be a fas- cinating object of research. Their distribution is due to the in part very complicated parasite life cycles which fre- quently depend on the presence of intermediate hosts. The search for the causes of the distribution of helminthiases requires to take into account not only such geofactors as affect the parasite developmental stages outside man but go beyond this and include the entire web of factors which contribute to the conditions for the distribution of their in-...