| impact of the crayfish procambarus clarkii on schistosoma haematobium transmission in kenya. | the louisiana red swamp crayfish, procambarus clarkii, which was introduced into east africa in the 1950s or 1960s, has since widely dispersed. previous work by our group has shown that p. clarkii can reduce populations of the molluscan intermediate hosts of human schistosomes through predatory and competitive interactions. here, we investigate whether crayfish can reduce populations of bulinus africanus and consequently, schistosoma haematobium prevalence in school children. children from 6 pri ... | 1999 | 10586907 |