Table 1.
Knockdown concentration (KC50 ) and resistance ratio (RRKC50) of 8 pyrethroids against Aedes aegypti females from Veracruz, Mexico.
| STRAIN | d-PHENOTHRIN | PERMETHRIN | DELTAMETHRIN | CYPERMETHRIN | α-CYPERMETHRIN | Z-CYPERMETHRIN | λ–CYHALOTHRIN | BIFENTHRIN |
|---|---|---|---|---|---|---|---|---|
| Panuco | 4211 | 413 | 311 | 342 | 359 | 294 | 480 | 480 |
| KC50 2 | 8.13 (4.67–14.68) | 2.28(1.71–2.96) | 0.063(0.046–0.089) | 0.263(0.190–0.368) | 0.141(0.113–0.177) | 0.223(0.180–0.282) | 0.014(0.010–0.019) | 0.09(0.060–0.140) |
| RRKC50 3 | 18.48 | 5.07 | 3.00 | 2.58 | 88.12 | 2.14 | 2.76 | 0.43 |
| b (± SE)4 | 0.533 (0.068) | 1.179 (0.121) | 1.139 (0.123) | 1.063 (0.111) | 1.534 (0.158) | 1.792 (0.177) | 0.905 (0.077) | 0.629 (0.062) |
| x2 (df)5 | 10.64 (4) | 12.32 (3) | 0.68 (3) | 8.08 (4) | 25.35 (4) | 6.05 (3) | 7.21 (6) | 8.78 (6) |
| Tantoyuca | 720 | 660 | 483 | 343 | 404 | 345 | 270 | 450 |
| KC50 | 3.26(2.53–4.16) | 1.48(1.27–1.70) | 0.017(0.015–0.020) | 0.108(0.076–0.148) | 0.047(0.032–0.070) | 0.561(0.432–0.727) | 0.016(0.009–0.029) | 0.18(0.140–0.230) |
| RRKC50 | 7.41 | 3.29 | 0.81 | 1.06 | 29.37 | 5.39 | 3.24 | 0.86 |
| b (± SE) | 0.998 (0.066) | 1.889 (0.143) | 1.992 (0.164) | 1.045 (0.120) | 0.807 (0.087) | 1.338 (0.140) | 0.484 (0.068) | 1.540 (0.191) |
| x2 (df) | 8.32 (10) | 15.17 (9) | 7.07 (6) | 1.36 (4) | 18.03 (5) | 14.15 (4) | 5.72 (5) | 8.35 (4) |
| Poza Rica | 664 | 600 | 299 | 325 | 339 | 318 | 480 | 405 |
| KC50 | 27.29(24.54–29.96) | 8.29(7.15–9.57) | 0.146(0.130–0.160) | 1.580(1.410–1.762) | 0.462(0.385–0.560) | 0.923(0.790–1.062) | 0.090(0.070–0.120) | 1.04(0.900–1.200) |
| RRKC50 | 62.02 | 18.42 | 6.95 | 15.49 | 288.75 | 8.87 | 18.00 | 4.95 |
| b (± SE) | 2.678 (0.226) | 1.801 (0.144) | 3.487 (0.325) | 3.247 (0.350) | 2.009 (0.184) | 2.640 (0.268) | 1.332 (0.129) | 2.132 (0.180) |
| x2 (df) | 67.46 (9) | 8.27 (8) | 0.021 (3) | 22.52 (4) | 1.94 (4) | 9.42 (4) | 11.62 (7) | 9.22 (8) |
| M.de la Torre | 300 | 300 | 379 | 418 | 287 | 341 | 369 | 517 |
| KC50 | 14.01(10.60–18.30) | 5.59(4.61–6.58) | 0.019 (0.014–0.026) | 1.145(1.00–1.294) | 0.361(0.307–0.428) | 0.260(0.199–0.339) | 0.016(0.014–0.019) | 0.153(0.127–0.187) |
| RRKC50 | 31.84 | 12.42 | 0.90 | 11.22 | 225.62 | 2.5 | 3.20 | 0.73 |
| b (± SE) | 1.461 (0.142) | 2.258 (0.270) | 1.112 (0.112) | 2.824 (0.245) | 2.319 (0.270) | 1.405 (0.128) | 1.749 (0.144) | 1.810 (0.175) |
| x2 (df) | 22.62 (3) | 12.68 (3) | 19.03 (4) | 17.88 (6) | 16.27 (3) | 6.09 (4) | 6.29 (6) | 15.81 (4) |
| Veracruz | 353 | 430 | 278 | 285 | 337 | 286 | 390 | 315 |
| KC50 | 25.47(21.70–29.80) | 2.66(2.23–3.14) | 0.154(0.132–0.177) | 0.281(0.231–0.339) | 0.245(0.204–0.297) | 0.333(0.259–0.426) | 0.086(0.060–0.120) | 4.40 (3.870–4.970) |
| RRKC50 | 57.89 | 5.91 | 7.33 | 2.75 | 153.12 | 3.20 | 17.20 | 20.95 |
| b (± SE) | 2.293 (0.220) | 1.913 (0.164) | 2.767 (0.291) | 2.108 (0.214) | 1.904 (0.186) | 1.557 (0.167) | 1.159 (0.118) | 2.814 (0.266) |
| x2 (df) | 15.10 (4) | 4.18 (5) | 5.35 (3) | 5.10 (3) | 9.80 (4) | 8.38 (3) | 7.38 (5) | 20.10 (6) |
| Coatzacoalcos | 380 | 361 | 302 | 370 | 334 | 283 | 225 | 270 |
| KC50 | 18.40(15.84–21.19) | 2.94(2.48–3.45) | 0.168(0.149–0.189) | 0.550(0.447–0.662) | 0.435(0.344–0.562) | 1.078(0.937–1.232) | 0.120(0.080–0.180) | 0.43(0.310–0.600) |
| RRKC50 | 41.82 | 6.53 | 8.00 | 5.39 | 271.87 | 10.36 | 24.00 | 2.05 |
| b (± SE) | 2.395 (0.229) | 2.192 (0.198) | 3.236 (0.318) | 2.105 (0.179) | 1.524 (0.147) | 3.108 (0.387) | 1.005 (0.117) | 1.306 (0.168) |
| x2 (df) | 6.62 (4) | 11.22 (4) | 7.51 (3) | 16.09 (5) | 10.82 (4) | 33.15 (3) | 6.40 (4) | 15.96 (3) |
| Cosoleacaque | 737 | 481 | 293 | 447 | 364 | 246 | 360 | 360 |
| KC50 | 3.78(3.05–4.46) | 0.68(0.57–0.80) | 0.030(0.023–0.038) | 0.256(0.198–0.319) | 0.122(0.089–0.167) | 0.203.(0.157–0.254) | 0.045(0.030–0.060) | 1.32(1.060–1.660) |
| RRKC50 | 8.59 | 1.51 | 1.43 | 5.39 | 76.25 | 1.29 | 9.00 | 6.29 |
| b (± SE) | 1.224 (0.086) | 1.693 (0.154) | 1.582 (0.181) | 1.537 (0.130) | 1.102 (0.102) | 1.806 (0.207) | 0.896 (0.087) | 1.498 (0.174) |
| x2 (df) | 9.10 (10) | 5.77 (6) | 15.62 (3) | 14.78 (6) | 8.00 (4) | 3.43 (2) | 21.63 (4) | 19.51 (4) |
| New Orleans | 287 | 300 | 340 | 375 | 426 | 370 | 360 | 360 |
| KC50 | 0.44(0.38–0.49) | 0.45(0.37–0.51) | 0.021(0.017–0.024) | 0.102(0.084–0.122) | 0.0016(0.0013–0.0018) | 0.104(0.081–0.135) | 0.005(0.0002–0.001) | 0.21(0.170–0.280) |
| b (± SE) | 3.018 (0.327) | 2.787 (0.330) | 2.798 (0.298) | 1.860 (0.174) | 1.994 (0.167) | 1.342 (0.125) | 0.998 (0.103) | 1.446 (0.140) |
| x2 (df) | 10.97 (3) | 13.51 (3) | 10.14 (4) | 19.55 (4) | 15.18 (5) | 1.18 (4) | 15.00 (4) | 45.17 (4) |
1
Number of females tested,
2
KC50, 50% knockdown concentration in μg/bottle, 95% confidence interval in parentheses,
3
RRKC50, resistance ratio: KC50 resistant strain/KC50 New Orleans strain,
4
Slope of regression line Probit-log, standard error (± SE) are in parentheses,
5
Chi-square (degree of freedom).