August20, 2015
(NaturalSociety.com) U.S. investigators are warning that drug-resistant head lice have been found in at least 25 states, and the bugs are expected to spread even further across the nation.
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Permethrin, part of the pyrethroid class of insecticides, has been used to fight head lice, mosquitoes, bedbugs, and other insects for years. Researchers say overuse of the drug has caused head lice and other insects to develop genetic mutations that make them completely resistant to permethrin. [1]
“It’s a very classic resistance story,” said study lead author Kyong Yoon, an assistant professor in the biological sciences and environmental sciences program at Southern Illinois University in Edwardsville.
“Permethrin products were introduced to U.S. consumers in the early ’90s,” Yoon said. “But the first registered problem was reported from Israel in 1995, probably because they had it in use even earlier. Then in 2000 we found genetic mutations causing resistance in head lice here.”
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