Introgression in Lake MalaŴi: Increasing the Threat of Human Urogenital Schistosomiasis?

Jay R. Stauffer, Henry Madsen, David Rollinson

Research output: Contribution to journalReview articlepeer-review

5 Scopus citations


For the last 15 years, we have studied the relationships among cichlid snail-eating fishes, intermediate snail-host density, and the prevalence of human infection of Schistosoma haematobium in Lake MalaŴi and concluded that the increase of human infection is correlated with the decrease in snail-eating fishes in the shallow waters of the lake. We postulated that a strain of S. haematobium from other parts of Africa, which was introduced into the Cape Maclear region of Lake MalaŴi by tourists, was compatible with Bulinus nyassanus - which is a close relative of B. truncatus, and interbred with the indigenous strain of S. haematobium, which ultimately produced via introgression a strain that can use both B. globosus and B. nyassanus as intermediate hosts. This actively evolving situation involving intermediate snail-host switching and decline of Trematocranus placodon, a natural cichlid snail predator, will impact on transmission of urogenital schistosomiasis within the local communities and on tourists who visit Lake MalaŴi.

Original languageEnglish (US)
Pages (from-to)251-254
Number of pages4
Issue number2
StatePublished - Jun 2014

All Science Journal Classification (ASJC) codes

  • Ecology
  • Health, Toxicology and Mutagenesis


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