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1 January 2005 Method to Measure Force Required to Remove Pediculus humanus capitis (Phthiraptera: Pediculidae) Eggs from Human Hair
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Abstract

Head lice are very common and mainly affect children between 3 and 12 yr old. Little is known about the way nits, the eggs of the head louse, are attached to the hair. In this report, an objective measurement procedure for the ease with which nits can be removed is presented. The first peak force, associated with the start of nit movement, and the average and maximal force during the sliding of the nit were measured. The three force variables correlated with the length of the cylinder by which the nit was attached to the hair. A negative correlation was found between the maximum force exerted and the distance of the nit from the scalp. The method described in this report can be used to determine the in vitro efficacy of various products to remove nits.

Hilde Lapeere, Lieve Brochez, Yves Vander Haeghen, Cyriel Mabilde, Robert Vander Stichele, Luc Leybaert, and Jean-Marie Naeyaert "Method to Measure Force Required to Remove Pediculus humanus capitis (Phthiraptera: Pediculidae) Eggs from Human Hair," Journal of Medical Entomology 42(1), 89-93, (1 January 2005). https://doi.org/10.1603/0022-2585(2005)042[0089:MTMFRT]2.0.CO;2
Received: 7 May 2004; Accepted: 20 October 2004; Published: 1 January 2005
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