title: Schistosomiasis in Lake Malaŵi villages.
abstract: Historically, open shorelines of Lake Malaŵi were free from schistosome, Schistosoma haematobium, transmission, but this changed in the mid-1980s, possibly as a result of over-fishing reducing density of molluscivore fishes. Very little information is available on schistosome infections among people in lake-shore communities and therefore we decided to summarise data collected from 1998 to 2007. Detailed knowledge of the transmission patterns is essential to design a holistic approach to schistosomiasis control involving the public health, fisheries and tourism sectors. On Nankumba Peninsula, in the southern part of the lake, inhabitants of villages located along the shores of Lake Malaŵi have higher prevalence of S. haematobium infection than those living in inland villages. Overall prevalence (all age classes combined) of urinary schistosomiasis in 1998/1999 ranged from 10.2% to 26.4% in inland villages and from 21.0% to 72.7% in lakeshore villages; for school children prevalence of infection ranged from 15.3% to 57.1% in inland schools and from 56.2% to 94.0% in lakeshore schools. Inhabitants on the islands, Chizumulu and Likoma, also have lower prevalence of infection than those living in lakeshore villages on Nankumba Peninsula. This increased prevalence in lakeshore villages is not necessarily linked to transmission taking place in the lake itself, but could also be due to the presence of more numerous typical inland transmission sites (e.g., streams, ponds) being close to the lake. Temporal data witness of intense transmission in some lakeshore villages with 30-40% of children cleared from infection becoming reinfected 12 months later (also lakeshore village). The level of S. mansoni infection is low in the lakeshore communities. Findings are discussed in relation to fishing in the lake.
authors: DBL Centre for Health Research and Development, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 57, 1871, Frederiksberg C, Denmark. hmad@life.ku.dk
authors: Henry
authors: H
authors: Madsen
authors: Paul
authors: P
authors: Bloch
authors: Peter
authors: P
authors: Makaula
authors: Happy
authors: H
authors: Phiri
authors: Peter
authors: P
authors: Furu
authors: Jay R
authors: JR
authors: Stauffer
references: J Helminthol. 2008 Dec;82(4):377-82
references: 18752711
references: Trends Parasitol. 2004 Jan;20(1):35-9
references: 14700588
references: MMWR Morb Mortal Wkly Rep. 1993 Jul 30;42(29):565-70
references: 8332113
references: Ann Trop Med Parasitol. 2001 Jun;95(4):353-60
references: 11454245
references: Lancet. 1996 Nov 9;348(9037):1274-8
references: 8909380
references: Acta Trop. 2000 Oct 23;77(1):69-80
references: 10996122
references: Rev Inst Med Trop Sao Paulo. 1972 Nov-Dec;14(6):397-400
references: 4675644