GOOD, MALARIA IS BAD: Noninvasive malaria test could aid in global reduction efforts.
Swiss chemist Paul Müller discovered the insecticidal power of a compound called dichloro-diphenyl-trichloroethane, better known as DDT. Müller was awarded the 1948 Nobel Prize in medicine for his discovery, for nothing in the history of insect control had ever worked like DDT. Microscopic amounts could kill mosquitoes for months, long enough to disrupt the cycle of malaria transmission. It lasted twice as long as the next best insecticide, and cost one-fourth as much.
Armed with the twin weapons of chloroquine and DDT, the World Health Organization in 1955 launched the Global Malaria Eradication Programme. The goal was to eliminate the disease within ten years. More than a billion dollars was spent. Tens of thousands of tons of DDT were applied each year to control mosquitoes. India, where malaria had long been a plague, hired 150,000 workers, full-time, to spray homes. Chloroquine was widely distributed. It was probably the most elaborate international health initiative ever undertaken.
The campaign was inspired by early successes in Brazil and the United States. The U.S. had recorded millions of malaria cases during the 1930s, mostly in southern states. Then an intensive antimalaria program was launched. More than three million acres (1.2 million hectares) of wetlands were drained, DDT was sprayed in hundreds of thousands of homes, and in 1946 the Centers for Disease Control was founded in Atlanta specifically to combat malaria.
America’s affluence was a major asset. Almost everyone could get to a doctor; windows could be screened; resources were available to bulldoze mosquito-breeding swamps. There’s also the lucky fact that the country’s two most common species of Anopheles mosquitoes prefer feeding on cattle rather than humans. By 1950, transmission of malaria was halted in the U.S.
The global eradication effort did achieve some notable successes. Malaria was virtually wiped out in much of the Caribbean and South Pacific, from the Balkans, from Taiwan. In Sri Lanka, there were 2.8 million cases of malaria in 1946, and a total of 17 in 1963. In India, malaria deaths plummeted from 800,000 a year to scarcely any. . . .
Soon after the program collapsed, mosquito control lost access to its crucial tool, DDT. The problem was overuse—not by malaria fighters but by farmers, especially cotton growers, trying to protect their crops. The spray was so cheap that many times the necessary doses were sometimes applied. The insecticide accumulated in the soil and tainted watercourses. Though nontoxic to humans, DDT harmed peregrine falcons, sea lions, and salmon. In 1962 Rachel Carson published Silent Spring, documenting this abuse and painting so damning a picture that the chemical was eventually outlawed by most of the world for agricultural use. Exceptions were made for malaria control, but DDT became nearly impossible to procure. “The ban on DDT,” says Gwadz of the National Institutes of Health, “may have killed 20 million children.”
Rachel Carson is a historical criminal.
Related: Nick Kristof: It’s Time to Spray DDT. “Mosquitoes kill 20 times more people each year than the tsunami did, and in the long war between humans and mosquitoes it looks as if mosquitoes are winning. One reason is that the U.S. and other rich countries are siding with the mosquitoes against the world’s poor — by opposing the use of DDT.”