Word: pyrethroids
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Dates: during 2004-2004
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Recent experience in South Africa shows just how well DDT can work. In 1996 the South African government, under pressure from international and domestic environmental groups, decided to phase out its use of DDT in residential spraying and rely instead on pesticides containing pyrethroid chemicals. Unfortunately, it turned out that many anopheles mosquitoes in South Africa were resistant to pyrethroids. The number of cases of malaria, which had been hovering between 8,000 and 13,000 a year, grew steadily worse, and by the year 2000 it had reached 64,000 cases, with 423 deaths. When the government reintroduced...
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