Resistance of Aedes aegypti from the state of Säo Paulo, Brazil, to organophosphates insecticides
Mem. Inst. Oswaldo Cruz
; 98(5): 703-708, July 2003. mapas, tab, graf
Article
in En
| LILACS, SES-SP
| ID: lil-344293
Responsible library:
BR1.1
RESUMO
Since the reintroduction of Aedes aegypti in the state of Säo Paulo, in the middle of the 1980-decade, organophosphate insecticides are being used to control the dengue vector. In 1996, an annual program for monitoring the susceptibility of Ae. aegypti to the insecticides was implemented. Some of the results of this monitoring program are presented. Ae. aegypti populations from ten localities have been submitted to bioassays with the diagnostic dose of temephos and fenitrothion. Only two (Marília and Presidente Prudente) remain susceptible to both insecticides and one (Santos) exhibits true resistance. Ae. aegypti from the remaining localities showed an incipient altered susceptibility. Resistance ratios varied from 1.2 to 2.9 for temephos and from 1.5 to 3.2 to fenitrothion, indicating moderate levels of resistance. Biochemical assays did not detect alterations in the enzyme acetilcholinesterase, but indicated that resistance is associated with esterases
Full text:
1
Index:
LILACS
Main subject:
Temefos
/
Aedes
/
Insecticides, Organophosphate
/
Fenitrothion
Limits:
Animals
Country/Region as subject:
America do sul
/
Brasil
Language:
En
Journal:
Mem. Inst. Oswaldo Cruz
Journal subject:
MEDICINA TROPICAL
/
PARASITOLOGIA
Year:
2003
Type:
Article