Superlouse

John Clark, professor of Environmental Toxicology at the University of Massachusetts, knows his lice. This is a man who keeps a colony alive on what?s essentially a giant fake human head, and he wasn?t surprised by our malathion fail. Some lice have a genetic mutation that leaves them immune to malathion, he said when we chatted; in Israel, the U.K., Denmark, and for that matter pretty much everywhere outside the United States, natural selection has long since favored lice with this resistance. The malathion lotion sold in the United States is slightly different than that used in other countries, however, and so far this has proved to be a saving grace: Three of the ?inactive? ingredients intended to improve the smell of the American formulation turn out to also kill lice, as does the 78 percent isopropyl alcohol that makes up the rest of the bottle.

Source: http://feeds.slate.com/click.phdo?i=c4480daf6d7784c9330f8be14f79a972

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