A baseline of organophosphate susceptibility/resistance in Trinidad and Tobago strains of the dengue fever vector Aedes aegypti (Linnaeus)
West Indian med. j
; 49(Supp 2): 30, Apr. 2000.
Article
in English
| MedCarib
| ID: med-970
Responsible library:
JM3.1
Localization: JM3.1; R18.W4
ABSTRACT
OBJECTIVE:
To establish a baseline of organophosphate susceptibility/resistance in Trinidad and Tobago strains of 4th instar Aedes aegypti. DESIGN ANDMETHODS:
Twenty-one strains of Aedes aegypti (Linneaus) were collected throughout Trinidad and Tobago and 4th instar larvae were bioassayed for sensitivity to five organophosphate insecticides, temephos, malathion, fenthion, fenitrothion and bromophos. The data were computer probit analyzed, resistance ratios [RR] were calculated and statistical analysis was done to determine any incidence of cross-resistance.RESULTS:
Low to moderate levels of larval resistance to tenephos [RR 0.8-6.3], malathion [RR 0.8-3.8], fenthion [RR 0.7-6.7], fenitrothion [RR 0.7-3.] and bromophos [RR 0.9-6.4] were observed. Significant levels of cross-resistance were found between pairs of insecticides as follows temephos/fenthion [rsq = 0.6219]; temephos/fenitrothion [rsq = 0.6117]; fenthion/malathion [rsq = 0.5751]; fenthion/bromophos. [rsq = 0.7255] and fenthion/fenitrothion [rsq = 0.6111].CONCLUSIONS:
The generally low levels of organophosphate insecticide resistance shown in this study indicate that these chemicals can continue to be used in the fight against Ae aegypti and dengue, while we continue to monitor trends in changing resistance patterns.(AU)
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Collection:
International databases
Health context:
SDG3 - Health and Well-Being
/
Neglected Diseases
Health problem:
Target 3.3: End transmission of communicable diseases
/
Dengue
/
Neglected Diseases
/
Zoonoses
Database:
MedCarib
Main subject:
Aedes
/
Dengue
/
Insecticides, Organophosphate
/
Larva
Country/Region as subject:
English Caribbean
/
Trinidad and Tobago
Language:
English
Journal:
West Indian med. j
Year:
2000
Document type:
Article