Tuesday, 19 November 2002
D0262

This presentation is part of : Display Presentations, Section B. Physiology, Biochemistry, Toxicology, and Molecular Biology

Increased permethrin resistance frequency in head louse (Pediculus capitis) populations from California, Florida, and Texas

Jian-Rong Gao1, Kyong-Sup Yoon1, Si Hyeock Lee2, Miwa Takano-Lee3, J.D. Edman4, Terri L. Meinking5, David Taplin5, and J. Marshall Clark1. (1) University of Massachusetts, Department of Entomology, Fernald Hall, Amherst, MA, (2) Seoul National University, School of Agricultural Biotechnology, College of Agriculture and life Science, Suwon, MA, South Korea, (3) University of California, Veterinary Medicine, Center for Vector-Borne Diseases, One Shields Avenue, Davis, CA, (4) University of California, Department of Entomology, One Shields Avenue, Davis, CA, (5) University of Miami, Depeartment of Dermatology and Cutaneous Surgery, School of Medicine, Miami, FL

Permethrin resistance was investigated in head louse populations from California, Florida and Texas. Resistance frequency based on insecticide impregnated filter-paper bioassay is 41, 87 and 89%, respectively. Genotyping analysis showed that T929I and L932F mutations are tightly linked together and the resistant allele frequency by analysis of these mutations is 55, 96 and 91, respectively. The resistance gene is recessive. Presence of resistant homozygotes correlated quite well with the permethrin resistant phenotype, indicating altered voltage-gated sodium channel gene plays a major role in permethrin resistance in human head lice.

Species 1: Phthiraptera Pediculidae Pediculus capitis (human head louse)
Keywords: insecticide resistance

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