We developed a rapid and economical in vitro procedure with which to evaluate the efficacy of candidate repellents against chiggers. The procedure requires only 5 min and a small number of chiggers to obtain a valid estimate of the median effective dose. We used this procedure to evaluate the repellent activity of 11 compounds against the chigger, Leptotrombidium imphalum Vercammen-Grandjean and Langston. Median effective doses were determined for 10 of the 11 compounds. DM-165-2 (N,N-diethyl-3-flurobenzamide) was the only compound that was significantly more effective than deet.
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1 January 2003
Development of an In Vitro Method for the Evaluation of Candidate Repellents Against Leptotrombidium (Acari: Trombiculidae) Chiggers
Kriangkrai Lerdthusnee,
Nittaya Khlaimanee,
Taweesak Monkanna,
Siriporn Mungviriya,
Warisa Leepitakrat,
Mustapha Debboun,
Russell E. Coleman
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Journal of Medical Entomology
Vol. 40 • No. 1
January 2003
Vol. 40 • No. 1
January 2003
chiggers
Leptotrombidium
personal protection
repellents
scrub typhus