Table 1.
Lethal concentrations (g/l) of Amblyomma variegatum and Rhipicephalus microplus and their resistance to deltamethrin and cypermethrin regarding to strain Rhipicephalus geigyi as reference strain
| Tick species | LC50 (95% CI) | LC90 (95% CI) | RR50 (95% CI) | RR90 (95% CI) | Slopes |
|---|---|---|---|---|---|
| Deltamethrin | |||||
| R. geigyi | 0.0031 (0.0030–0.00323) | 0.0066 (0.0064–0.0068) | –- | –- | − 2.934 ± 0.125 |
| A. variegatum | 0.0016 (0.0015–0.0016) | 0.0031 (0.0001–0.0032) | 0.50 (0.48–0.53) | 0.48 (0.43–0.53) | − 3.161 ± 0.146 |
| R. microplus | 0.0879 (0.0776–0.0963) | 0.2142 (0.1899–0.2385) | 28.18 (24.93–32.41) | 32.41 (25.24–45.25) | − 2.437 ± 0.243 |
| Cypermethrin | |||||
| R. geigyi | 0.0062 (0.0059–0.0065) | 0.009567 (0.0091–0.010 | –- | –- | − 5.020 ± 0.430 |
| A. variegatum | 0.0042 (0.0040–0.0044) | 0.0076 (0.0073–0.0079) | 0.68 (0.64–0.72) | 0.79 (0.69–0.90) | − 3.706 ± 0.255 |
| R. microplus | 0.0547 (0.0484– 0.0610) | 0.2258 (0.2012–0.2504) | 8.79 (7.83–10.02) | 23.15 (18.43–31.10) | − 1.550 ± 0.003 |
Legend: R, Rhipicephalus; A, Amblyomma; LC, lethal concentration; CI, confidence interval; RR, resistance ratio.