Table 3. Insecticide susceptibility status of Aedes albopictus against 4% DDT, 0.05% deltamethrin, and 5% malathion in West Bengal.
| Insecticides | Districts | Blocks | Mosquito exposed | Mosquito died | Observed Mortality (%) | CM (%) | KDT10 (min.) [95% CI] |
KDT50 (min.) [95% CI] |
KDT95 (min.) [95% CI] |
χ2 (p) | Slope | Status# | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| T* | C* | T* | C* | T* | C* | ||||||||||
| 4% DDT | Darjeeling | Siliguri | 160 | 40 | 136 | 0 | 85.00 | 0 | 85.00 | 12.82 [9.05–14.75] | 28.59 [23.6–34.39] | 80.10 [69.57–119.04] | 19.59 (0.002) | 3.68 (± 0.2) | R |
| Matigara | 160 | 40 | 96 | 2 | 60.00 | 5.00 | 57.89 | 11.98 [9.45–14.24] | 42.17 [37.90–47.91] | 212.11 [155.71–329.21] | 3.24 (0.7) | 2.34 (± 0.2) | R | ||
| Khoribari | 160 | 40 | 132 | 0 | 82.50 | 0 | 82.50 | 13.26 [11.47–14.89] | 30.36 [28.31–32.57] | 87.91 [76.28–105.28] | 7.53 (0.2) | 3.56 (± 0.2) | R | ||
| Jalpaiguri | Dhupguri | 160 | 40 | 122 | 2 | 76.25 | 5.00 | 75.00 | 17.39 [11.08–20.41] | 51.39 [43.11–73.09] | 206.49 [172.26–538.03] | 15.83 (0.007) | 2.72 (± 0.3) | R | |
| Malbazar | 160 | 40 | 138 | 2 | 86.25 | 5.00 | 85.53 | 7.65 [5.97–9.22] | 23.62 [21.48–25.83] | 100.42 [82.50–130.47] | 2.91 (0.7) | 2.62 (± 0.2) | R | ||
| U. Dinajpur | Itahar | 160 | 40 | 38 | 0 | 23.75 | 0 | 23.75 | 11.02 [9.04–12.82] | 31.57 [29.03–34.46] | 121.92 [99.52–159.70] | 6.06 (0.3) | 2.80 (± 0.2) | R | |
| 0.05% deltamethrin | Darjeeling | Siliguri | 160 | 40 | 157 | 1 | 98.13 | 2.50 | 98.08 | 4.48 [2.38–5.56] | 12.09 [8.84–14.35] | 43.28 [36.38–63.51] | 12.93 (0.02) | 2.97 (± 0.3) | S |
| Matigara | 160 | 40 | 158 | 0 | 98.75 | 0 | 98.75 | 6.45 [5.26–7.46] | 11.60 [10.57–12.51] | 24.63 [22.25–28.27] | 0.95 (0.9) | 5.03 (± 0.5) | S | ||
| Khoribari | 160 | 40 | 160 | 0 | 100.00 | 0 | 100 | 6.69 [5.63–7.67] | 13.07 [11.97–14.09] | 30.84 [28.20–34.41] | 0.94 (0.9) | 4.41 (± 0.3) | S | ||
| Jalpaiguri | Dhupguri | 160 | 40 | 154 | 2 | 96.25 | 5.00 | 96.25 | 7.29 [6.24–8.24] | 13.82 [12.76–14.82] | 31.43 [28.84–34.87] | 1.99 (0.8) | 4.61 (± 0.3) | PR | |
| Malbazar | 160 | 40 | 158 | 2 | 98.75 | 5.00 | 98.68 | 5.05 [3.84–6.27] | 11.86 [10.47–13.13] | 35.49 [31.37–41.68] | 6.4 (0.3) | 3.46 (± 0.2) | S | ||
| U. Dinajpur | Itahar | 160 | 40 | 160 | 0 | 100.00 | 0 | 100 | 5.38 [4.09–6.47] | 10.14 [8.94–11.14] | 22.85 [20.52–26.54] | 1.09 (0.9) | 4.67 (± 0.5) | S | |
| 5% malathion | Darjeeling | Siliguri | 160 | 40 | 160 | 0 | 100.00 | 0 | 100 | 10.85 [8.02–12.03] | 17.52 [14.65–20.53] | 32.39 [29.26–44.23] | 24.35 (0.0002) | 6.16 (± 0.4) | S |
| Matigara | 160 | 36 | 158 | 2 | 98.75 | 5.56 | 98.68 | 10.85 [8.15–12.58] | 23.79 [20.27–27.49] | 65.17 [56.16–87.18] | 13.64 (0.01) | 3.76 (± 0.2) | S | ||
| Khoribari | 160 | 40 | 158 | 0 | 98.75 | 0 | 98.75 | 9.31 [7.76–10.76] | 23.49 [21.67–25.36] | 77.04 [66.47–92.98] | 9.73 (0.08) | 3.19 (± 0.2) | S | ||
| Jalpaiguri | Dhupguri | 160 | 40 | 160 | 2 | 100.00 | 5.00 | 100 | 13.70 [10.09–15.51] | 25.31 [20.97–29.99] | 55.59 [49.19–76.13] | 24.83 (0.0002) | 4.81 (± 0.3) | S | |
| Malbazar | 160 | 35 | 158 | 1 | 98.75 | 2.86 | 98.71 | 9.75 [8.40–10.98] | 20.90 [19.44–22.37] | 55.64 [49.69–63.99] | 6.31 (0.3) | 3.87 (± 0.2) | S | ||
| U. Dinajpur | Itahar | 160 | 40 | 156 | 0 | 97.50 | 0 | 97.50 | 12.71 [6.77–13.47] | 21.68 [15.34–28.79] | 43.08 [40.94–81.72] | 65.38 (<0.0001) | 5.52 (± 0.3) | S | |
*T = Test, C = Control, CM = Corrected Mortality
#S = Susceptible (CM ≥98%); R = Confirmed Resistance (CM <90%); PR = Possible Resistance (CM = 90–97%)