Forty years ago the distribution of malaria in Deltaic Bengal was patchy. A conspicuous feature was thatrnlow-lying, waterlogged areas subject to seasonal flooding were less malarious than other areas. Literaturernreviews list the evidence that embankments constructed for flood control, railways, and roads reducedrnthe spread of silty water, and thereby facilitated vector breeding and increased malaria prevalence. Thisrnassociation of malaria with embankments has clear implications for flood control and drainage programs
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