Head lice beginning to show permethrin resistance

Head lice beginning to show permethrin resistance
Although live head lice obtained from school-aged children in Paris remain susceptible to the insecticide malathion, approximately 14 percent have been found to be resistant to permethrin, suggesting a strong basis for future insecticide resistance, according to research published online May 24 in the Journal of the American Academy of Dermatology.

(HealthDay) -- Although live head lice obtained from school-aged children in Paris remain susceptible to the insecticide malathion, approximately 14 percent have been found to be resistant to permethrin, suggesting a strong basis for future insecticide resistance, according to research published online May 24 in the Journal of the American Academy of Dermatology.

Sophie Bouvresse, M.D., of the Henri Mondor Hospital in Paris, and colleagues conducted a prospective, population-based observational study of 14,436 school-aged children from 74 elementary schools to evaluate the occurrence of permethrin- and malathion-resistant head lice.

Live head lice were found in 574 children. The researchers observed that no lice survived after one hour of malathion treatment, while 85.7 percent of lice died after a one-hour exposure to permethrin and piperonyl butoxide. Of the 670 lice for which DNA could be studied, 98.7 percent were homozygous for the kdr mutation, which confers resistance to permethrin, suggesting a strongly-established in this population.

"Further studies are necessary to identify all contributors to pyrethroid resistance, such as head louse attributes and possible host factors," the authors write. "Long-term surveillance of insecticidal resistance could be important to guide for head lice."

Two authors disclosed to pharmaceutical companies.

More information: Abstract
Full Text (subscription or payment may be required)

Related Stories

Body lice originate from head lice

date Mar 25, 2010

Body lice, which cause highly lethal epidemics (trench fever, typhus and relapsing fever Borrelia), originate from head lice. This has recently been shown by a team from the Emerging Infectious and Tropical Diseases Research ...

'LouseBuster' Instrument Shown to Kill Head Lice

date Nov 06, 2006

Biologists have invented a chemical-free, hairdryer-like device - the LouseBuster - and conducted a study showing it eradicates head lice infestations on children by exterminating the eggs, or "nits," and killing ...

Recommended for you

Philippines confirms second MERS case (Update)

date 2 hours ago

A foreigner who flew to the Philippines from the Middle East has become the second confirmed case of MERS in the country, the health department said Monday, as a deadly outbreak in South Korea spreads alarm across Asia.

Immigrant children given adult dose of hepatitis A vaccine

date Jul 04, 2015

About 250 immigrant children were given an adult dose of a hepatitis A vaccine at a Texas detention facility where they were being held with their mothers, according to U.S. Immigration and Customs Enforcement officials.

User comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.