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During the recent past, development of DDT resistance and reduction to pyrethroid susceptibility among the malaria vectors has posed a serious challenge in many Southeast Asian countries including India. Current study presents the insecticide susceptibility and knock-down data of field collected  Anopheles annularis  sensu lato and  An .  vagus  mosquito species from endemic areas of Assam in northeast India.  Anopheles annularis  s.l. and  An .  vagus  adult females were collected from four randomly selected sentinel sites in Orang primary health centre (OPHC) and Balipara primary health centre (BPHC) areas, and used for testing susceptibility to DDT, malathion, deltamethrin and lambda-cyhalothrin. After insecticide susceptibility tests, mosquitoes were subjected to VectorTest ™  assay kits to detect the presence of malaria sporozoite in the mosquitoes.  An .  annularis  s.l. was completely susceptible to deltamethrin, lambda-cyhalothrin and malathion in both the study areas.  An .  vagus  was highly susceptible to deltamethrin in both the areas, but exhibited reduced susceptibility to lambda-cyhalothrin in BPHC. Both the species were resistant to DDT and showed very high KDT 50  and KDT 99  values for DDT. Probit model used to calculate the KDT 50  and KDT 99  values did not display normal distribution of percent knock-down with time for malathion in both the mosquito species in OPHC (p<0.05) and  An .  vagus  in BPHC (χ 2  = 25.3; p = 0.0), and also for deltamethrin to  An .  vagus  in BPHC area (χ 2  = 15.4; p = 0.004). Minimum infection rate (MIR) of  Plasmodium  sporozoite for  An .  vagus  was 0.56 in OPHC and 0.13 in BPHC, while for  An .  annularis  MIR was found to be 0.22 in OPHC. Resistance management strategies should be identified to delay the expansion of resistance. Testing of field caught  Anopheles  vectors from different endemic areas for the presence of malaria sporozoite may be useful to ensure their role in malaria transmission.

Evaluation of Insecticides Susceptibility and Malaria Vector Potential of Anopheles annularis s.l. and Anopheles vagus in Assam, India