Why is malathion-resistant pediculosis and pthiriasis (lice infestation) more common in the United Kingdom than in the US?

Updated: Aug 16, 2019
  • Author: Lyn C C Guenther, MD, FRCPC, FAAD; Chief Editor: Michael Stuart Bronze, MD  more...
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Answer

Resistance to malathion has been reported in the United Kingdom; however, the UK formulation contains only malathion, whereas, in the US formulation, malathion is coupled with isopropyl alcohol and terpineol.


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