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During the early 1990s the Medical Entomology Centre, Cambridge, received an increasing number of reports from concerned health professionals of treatments against head lice failing to cure. Preliminary investigations showed some lice to have developed tolerance of pyrethroid insecticides. A series ...

In 1994 evidence was obtained that insecticide resistance in head lice was spreading in the United Kingdom and other countries. The situation was not being managed correctly by the health authorities in UK for two reasons: primary health care workers adhered to rigid procedures regardless of the cha...