Mutant lice resistant to most common treatments found in 25 states

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Just in time for the back-to-school season, new research indicates that half of America is infested with a form of head lice that is resistant to most over-the-counter treatments.

Researchers presented their findings at the 250th American Chemical Society meeting Tuesday in Boston.

‘What we found was that 104 out of the 109 lice populations we tested had high levels of gene mutations,” said Kyong Yoon, who conducted the research. “Which have been linked to resistance to pyrethroids.’

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Pyrethroids are a type of incesticide that include a chemical also used in many lice treatments widely recommended by doctors and schools and available in most drug stores.

Yoon gathered lice from 30 states for the study. He found that the lice had a trio of genetic mutations known as “knock-down resistance.” The mutations affect the insect’s nervous system, desensitizing it to pyrethroids, according to the study.

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Yoon found the three mutations in lice in 25 states. New York, New Jersey, New Mexico and Oregon had one, two or three mutations. Michigan was the only state tested that is still susceptible to the mutation.

Lice in the following states are said to have developed a high level of resistance to the most common treatments recommended by doctors: 

Alabama 
Arizona

Arkansas

California

Connecticut

Florida

Georgia

Illinois

Indiana

Kansas

Kentucky

Maine

Maryland

Massachusetts

Minnesota

Missouri

North Carolina

Ohio

Rhode Island

South Carolina

Tennessee

Texas

Virginia

Washington

Wisconsin

The good news…

‘If you use a chemical over and over, these little creatures will eventually develop resistance,’ Yoon said. ‘So we have to think before we use a treatment. The good news is head lice don’t carry disease. They’re more a nuisance than anything else.’



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