Treatment of public lice infestation: a comparison of two agents.

Bulletins issued by both the United States Public Health Service and the Pan American Health Organization have noted a sharp increase in the incidence of public lice infestation (pediculosis pubis) in this country. At the Haight-Ashbury Free Medical Clinic we conducted a controlled, open study comparing the efficacy and safety of Kwell Shampoo (gamma benzene hexachloride; lindane) with RID, an over-the-counter, pyrethrin-based pediculicide. The results showed the two treatments to be equally effective and safe. All adult lice, nymphs, and nits were eradicated at the one week follow-up in fifteen patients treated with single applications of either product. Two patients in each group experienced very slight and transient erythema.