Sugar and snails: the ecology of bilharziasis related to agriculture in Puerto Rico.
D000383:Agriculture; D006725:Hookworm Infections / Q000453:epidemiology; D006801:Humans; D008288:Malaria / Q000453:epidemiology; D011647:Puerto Rico; D012552:Schistosomiasis / Q000453:epidemiology / Q000517:prevention & control / Q000635:transmission*; D012908:Snails / Q000469:parasitology*