Most head lice found in North America now carry a gene mutation that makes them resistant to standard over-the-counter treatments, a new study cautions.
Head lice infestation is a major public-health issue, the researchers said, with roughly 10 percent of all American school-aged children missing school due to the intense itching and secondary infections that signal exposure.
The problem: Years of relentless exposure to a single treatment option has given rise to a surviving head lice population that is armed with what geneticists call «knockdown resistance,» in the form of the TI genetic muta...
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