Impact of Wearing and Washing/Drying of Permethrin-Treated Clothing on Their Contact Irritancy and Toxicity for Nymphal Ixodes scapularis (Acari: Ixodidae) Ticks

Journal of Medical Entomology
Neeta ConnallyLars Eisen

Abstract

Permethrin-treated clothing is available as consumer products to prevent bites by tick and insect pests. We used bioassays to examine the impact of wearing and washing/drying of permethrin-treated shirts, pants, and socks, and wearing of treated shoes, on their contact irritancy and toxicity for nymphal Ixodes scapularis Say (Acari: Ixodidae) ticks, the primary vectors in the eastern United States of the causative agents of Lyme disease, human anaplasmosis, and human babesiosis. Pristine permethrin-treated clothing displayed strong contact irritancy and toxicity toward I. scapularis nymphs, with 0-30% of ticks across clothing types and tick sources displaying normal movement 1 h after forced contact for 30-120 s with treated textile. Following 16 d of wear and 16 rounds of machine washing and drying, we recorded reduced concentrations (by 50-90%) of permethrin, compared with pristine treated clothing, from shirts, pants, and socks. This loss of permethrin was associated with reduced contact irritancy and toxicity for ticks after forced contact with worn and washed/dried treated clothing: 31-67% of ticks displayed normal movement 1 h after contact. Nevertheless, the worn and washed/dried treated clothing was still superior to no...Continue Reading

References

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Citations

Oct 29, 2020·Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America·Henry M FederGary P Wormser

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