The activity of insecticides (CK50, CK95 ) from different chemical classes against permethrin-resistant body and head lice was investigated. Having developed resistance to pyrethroids (permethrin, d-phenothrin, cypermethrin, and deltamethrin), the lice remain susceptible to organophosphorus compounds, phenylpyrazoles, neonicotinoids, and avermectins. The susceptibility of lice to the insecticides having a mechanism of action that is different from that of pyrethroids does not depend on the level of their resistance to permethrin.

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