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In the examination of more than 350 collecting stations it was observed that populations of Australorbis glabratus, the vector for Schistosoma mansoni in Puerto Rico, are not maintained in reaches of streams steeper than 20 meters fall per 1000 meters of length. Water quality and other factors apparently cause the spotty distribution observed in reaches with suitable gradients.
Field Team from Department of Medical Zoology, Walter Reed Army Institute of Research, Walter Reed Army Medical Center, Washington 12, D. C.