Table 4.
Knockdown times in minutes of Aedes aegypti and Ae. albopictus exposed to 4% DDT and 0.05% deltamethrin. Estimates are from probit analyses with 95% confidence intervals (CI). Resistance ratios (RRs) are calculated as the ratio of the KDT50 of the field population to that of the control population
| Insecticide | Site | Ae. aegypti | Ae. albopictus | ||||
|---|---|---|---|---|---|---|---|
| KDT50 (95% CI) | KDT95 (95% CI) | KDT50 ratio (RR) | KDT50 (95% CI) | KDT95 (95% I CI) | KDT50 ratio (RR) | ||
| 4% DDT | |||||||
| IPB | 63 (57.6–71.9) | 115.6 (100.7–139.2) | 1.2 | 46.5 (43.2–50.7) | 91.4 (82.1–104.8) | 1 | |
| Sica 1 | 55.5 (53.4–58.1) | 85.2 (80.0–92.1) | 1.1 | 81.4 (70.0–103.5) | 133.0 (109.1–180.7) | 1.6 | |
| Lakouanga | 61.2 (57.9–65.5) | 98.0 (90.1–108.8) | 1.2 | 48.0 (46.1–50.3) | 71.4 (67.0–77.3) | 1 | |
| Ouango | 34.6 (32.6–36.5) | 61.1 (57.4–65.7) | 0.7 | 76.6 (65.1–98.0) | 172.0 (138.0–237.5) | 1.5 | |
| Ngongonon 3 | 40.4 (39.3–41.6) | 60.1 (57.9–62.6) | 0.8 | 30.5 (27.8–33.3) | 57.4 (52.2–64.8) | 0.6 | |
| 92 Logements | 79.8 (69.9–98.5) | 127.6 (106.3–169.5) | 1.6 | 65.5 (60.6–78.8) | 80.7 (71.1–108.1) | 1.3 | |
| Reference strain | 50.2 (47.3–52.2) | 90.4 (85.3–94.) | 1 | – | – | ||
| 0.05% deltamethrin | |||||||
| IPB | 14.8(11.9–15.2) | 23.5 (21.3–25.8) | 1.1 | 15.8 (8.1–21.5) | 27.8 (21.9–48.7) | 1.2 | |
| Sica 1 | 21.2 (14.9–26.3) | 40 (34.2–54.5) | 1.6 | 26.8 (18.2–33.6) | 54.9 (45.4–77.2) | 2 | |
| Lakouanga | 12.1 (10.7–14.7) | 27.4 (24.8–29.7) | 1 | 14.3 (11.8–16.1) | 23.5 (18–38.1) | 1.1 | |
| Ouango | 23.1(20.3–25.7) | 42.01 (38.0–47.7) | 1.7 | 10.1 (4.4–13.6) | 24.0 (19.5–34.3) | 0.8 | |
| Ngongonon 3 | 14.1 (12.1–15.9) | 26.3 (23.6–0.4) | 1.1 | 13.9 (12.5–15.2) | 28.1 (26.0–31.0) | 1 | |
| 92 Logements | 18.6 (17.8–19.5) | 29.3 (27.9–30.9) | 1.4 | 23.6 (13.8–30.9) | 45.0 (36.4–67.7) | 1.8 | |
| Reference strain | 13.4 (10.2–14.6) | 24.8 (22.3–24.1) | 1 | – | – | ||