NDLI: Standardization of a bottle assay—an indigenous method for laboratory and field monitoring of insecticide resistance and comparison with WHO adult susceptibility test

Content Provider	Springer Nature Link
Author	Elamathi, N. Barik, Tapan Kumar Verma, Vaishali Velamuri, Poonam Sharma Bhatt, R. M. Sharma, S. K. Raghavendra, Kamaraju
Copyright Year	2014
Abstract	The WHO adult susceptibility test is in use for insecticide resistance monitoring. Presently, materials are being imported from the Universiti Sains Malaysia, Malaysia and sometimes it is cost prohibitive. As an alternative, we present here a method of bottle bioassay using indigenous material. Different aspects related to the assay were studied and validated in the field. Bottle assay was standardized in the laboratory by using locally sourced material and laboratory-maintained insecticide-susceptible Anopheles stephensi and Aedes aegypti strains against technical grade deltamethrin and cyfluthrin insecticides dissolved in ethanol in a range of different concentrations. The frequency of use of the deltamethrin-coated bottles and shelf-life were determined. Discriminating dose for deltamethrin and cyfluthrin was 10 μg against An. stephensi and 2 μg against Ae. aegypti females. Insecticide-coated bottles stored at 25 to 35 °C can be used for three exposures within 7 days of coating. The study carried out in the laboratory was validated on wild caught An. culicifacies in the states of Odisha and Chhattisgarh against deltamethrin-coated bottles in comparison to WHO adult susceptibility test. Results of the study indicated that deltamethrin-coated bottles were effective up to three exposures within 7 days of coating for field population and 100 % mortality was recorded within 35 min as observed in laboratory studies for field collected susceptible population. Also in the WHO adult susceptibility test, 100 % knock-down within 35 min and 100 % mortality after 24 h holding period were observed in susceptible population, while in it was 50 % knock-down in 1 h and 64 % mortality after 24 h holding period for resistant population (50 % mortality in bottle assay in 60 min). The bottle assay can be used as an alternative to the WHO adult susceptibility test both in the laboratory and field for monitoring insecticide resistance in mosquito vectors using locally sourced material.
Starting Page	3859
Ending Page	3866
Page Count	8
File Format	PDF
ISSN	09320113
Journal	Parasitology Research
Volume Number	113
Issue Number	10
e-ISSN	14321955
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-08-08
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bottle assay Insecticide resistance Mosquitoes Shelf-life Usability period Deltamethrin Medical Microbiology Microbiology Immunology
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Veterinary Parasitology Insect Science

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