Published in Medical Letter on the CDC and FDA, June 10th, 2001
At issue are nits - the egg casings for the tiny, itchy, bloodsucking insects. Lice are generally harmless but contagious, and many schools have adopted "no-nit" policies barring youngsters with nits even when there is no evidence of lice.
Nits resemble tiny white grains and may contain developing lice. But some are simply empty shells. They often remain attached to hair long after adequate treatment, according to the study by researchers at the U.S. Centers for...
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