CNN's Elizabeth Cohen on a new report that says head lice may be becoming resistant to over-the-counter treatments.
The head louse is an obligate ectoparasite of humans that causes pediculosis capitis. Head lice are wingless insects spending their entire life on the human scalp and feeding exclusively on human blood. As parents prepare to send their kids back to school, it appears head lice have developed a "high level" of resistance popular treatments.
