Abstract |
The aim of the currrent investigation was to evaluate (a) the toxicity of three pyrethroids ( deltamethrin, lambda-cyhalothrin, and tetramethrin); (b) the effect of these insecticides on the locomotor activity; and (c) the repellent effect of N,N-diethyl-m-toluamide ( DEET) on two deltamethrin-resistant strains of Triatoma infestans from Argentina (El Chorro and La Toma), and one susceptible strain. The resistance ratios (RRs) obtained for the La Toma strain were: > 10,769, 50.7, and > 5.2 for deltamethrin, lambda-cyhalothrin, and tetramethrin respectively. The RRs for the El Chorro strain were: > 10,769, 85.8, and > 5.2 for deltamethrin, lambda-cyhalothrin, and tetramethrin respectively. The hyperactivity usually caused by the three pyrethroids was in both the deltamethrin-resistant strains compared to the susceptible reference strain. No differences were observed in the repellent effect of DEET between the three groups. These results indicate that the deltamethrin-resistant insects have a cross resistance to lambda-cyhalothrin and tetramethrin, and are also resistant to the first symptom of pyrethroid poisoning (hyperactivity). However, the sensorial process related to DEET repellency does not appear to be altered.
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Authors | Valeria Sfara, Eduardo N Zerba, Raúl A Alzogaray |
Journal | Memorias do Instituto Oswaldo Cruz
(Mem Inst Oswaldo Cruz)
Vol. 101
Issue 1
Pg. 89-94
(Feb 2006)
ISSN: 0074-0276 [Print] Brazil |
PMID | 16699715
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Insect Repellents
- Insecticides
- Pyrethrins
- DEET
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Topics |
- Animals
- DEET
- Insect Repellents
- Insecticides
(toxicity)
- Lethal Dose 50
- Motor Activity
(drug effects)
- Nymph
(drug effects)
- Pyrethrins
(toxicity)
- Triatoma
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