Insecticide resistance status of Aedes aegypti and Aedes albopictus mosquitoes in Papua New Guinea

Parasites & Vectors

Table 2 Bioassay results for Aedes albopictus, including samples collected in Madang and Port Moresby. Values are given as proportions and 95% CI [35]

Insecticide, location	Mean knockdown after 60 min (95% CI)	Mean mortality after 24 h (95% CI)
0.05% deltamethrin, Madang (n = 273)	0.98 (0.96–0.99)	1.00 (0.98–1.00)
0.05% deltamethrin, Port Moresby (n = 11)^a	0.92 (0.60–1.00)	0.92 (0.60–1.00)
0.05% lambda-cyhalothrin, Madang (n = 135)	1.00 (0.97–1.00)	1.00 (0.97–1.00)
0.1% bendiocarb, Madang (n = 123)	1.00 (0.96–1.00)	1.00 (0.96–1.00)
4% DDT, Madang (n = 145)^b	0.62 (0.54–0.70)	0.79 (0.72–0.85)
5% malathion, Madang (n = 81)	0.99 (0.93–1.00)	0.96 (0.89–0.99)

^aThe number of mosquitoes tested against deltamethrin in Port Moresby (n = 11) is too low to be statistically robust and these results are included for reason of completeness
^bDDT is known to act more slowly [19] in anophelines, even in susceptible populations. Therefore, we also determined 48 h mortality for most (n = 129) Ae. albopictus mosquitoes exposed to DDT. Mortality after 48 h was unchanged at 0.77 (0.69–0.83)
Abbreviations: n, number of mosquitoes; CI, confidence interval

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