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      Bulinus nyassanus is an intermediate host for Schistosoma haematobium in Lake Malawi.

      Annals of Tropical Medicine and Parasitology
      Animals, Bulinus, genetics, growth & development, parasitology, Child, Cricetinae, Female, Humans, Male, Mesocricetus, Schistosomiasis haematobia, transmission, veterinary

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          Abstract

          At Cape Maclear on the Nankumba Peninsula, close to the southern end of Lake Malawi, Schistosoma haematobium is highly prevalent in the local people and many tourists become infected with this parasite each year. A 'Bilharzia Control Programme' was initiated in this area in August 1998, as a development collaboration between the Government of Malawi, the Danish Agency for Development Assistance (Danida), and the Danish Bilharziasis Laboratory. Although Bulinus globosus is a known host for S. haematobium, B. nyassanus has not previously been incriminated as an intermediate host. However, schistosome-infected B. nyassanus were discovered in surveys to identify transmission sites on the peninsula. Experimental infections of wild-caught B. nyassanus with S. haematobium proved successful and S. haematobium eggs were found in hamsters experimentally exposed to cercariae retrieved from schistosome-infected, field-collected B. nyassanus. These are remarkable observations since, although there are very few reports of diploid members of this species group being experimentally infected with S. haematobium, B. nyassanus is a diploid member (2n = 36) of the truncatus/tropicus group. Bulinus nyassanus is probably responsible for transmission in Lake Malawi, along rather exposed shorelines, devoid of aquatic macrophytes, with a substrate of sand or gravel.

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          Author and article information

          Journal
          11454245
          10.1080/00034980120065813

          Chemistry
          Animals,Bulinus,genetics,growth & development,parasitology,Child,Cricetinae,Female,Humans,Male,Mesocricetus,Schistosomiasis haematobia,transmission,veterinary

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