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Case Reports
. 2000 Nov;41(4):250-4.
doi: 10.1046/j.1440-0960.2000.00447.x.

Persistent head lice following multiple treatments: evidence for insecticide resistance in Pediculus humanus capitis

A M Bailey  1 , P Prociv
Affiliations
Case Reports

Persistent head lice following multiple treatments: evidence for insecticide resistance in Pediculus humanus capitis

A M Bailey et al. Australas J Dermatol. 2000 Nov.

Abstract

Viable head lice were found on the scalps of two family members following multiple topical insecticide treatments. The possibility of reinfestation had been reliably excluded. Persistent infestation could be diagnosed only after cutting the hair and combing repeatedly, which allowed visualization of juvenile (nymphal) and adult lice. Insecticide-resistant headlouse infestations are probably much more common than is generally realised and may persist unnoticed, so that more aggressive approaches will be needed to eradicate these ectoparasites from individuals and communities.

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