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US School Kids Face Battle With Drug-resistant Head Lice

As U.S. children get ready to return to school, health authorities warn of a new strain of head lice that is resistant to conventional chemical treatment. The bug causes missed school days and may be hard to get rid of. A new research presented at the annual meeting of the American Chemical Society last week in Boston suggests that lice populations in at least 25 states have built up tolerance to pyrethroid, an insecticide contained in standard lice-treating products. Zlatica Hoke reports.