To the Editor.—
A detailed evaluation of the relative pediculicidal and ovicidal activity of six marketed products was presented in the March 1986 Archives.1 The study, which is an attempt to develop a standardized in vitro method of screening for pediculicidal and ovicidal activity, points out the many difficulties involved. However, the approach used by Mienking and co-workers in evaluating pediculicidal activity does not, I believe, provide a closer resemblance to natural conditions than the more commonly used method of dipping lice into the test solution for specified times followed by a water rinse. Their method does not provide coverage of the entire louse as occurs when a pediculicide lotion or shampoo is applied to a person's head. Their finding of 100% effectiveness can be attributed to the fact that they only studied potent chemicals. On the other hand, this method might be an efficient way of screening out
McIlreath FJ. Pediculicides and Ovicides. Arch Dermatol. 1986;122(4):373. doi:10.1001/archderm.1986.01660160023002
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