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- termediate hosts. Last, but by no means least, it is,
however, man who through his customs and habits, his settlements
and dwellings, his population density and, above all, his
interference in the environment, determines the distri- bution of
helminthiases. The frequency, persistence and areal expansions are
a consequence of the interplay and in- teraction of all the
geofactors. The aim of every geomedi- cal analysis must be to prove
the causes of their distri- bution through a chain of causation
which has no gaps. A classic example of such a chain had already
been set out in the 1920s when Ernst Rodenwaldt investigated the
occur- rence of brugiasis in the Serajoe Delta on Java, and it is
Rodenwaldt's analysis which has served as a model for this work.
The idea of producing the monograph presented here arose from the
Geomedical Monograph Series edited by Helmut 1. Jusatz.
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