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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 KDT 50 of the field population to that of the control population

From: Susceptibility profile and metabolic mechanisms involved in Aedes aegypti and Aedes albopictus resistant to DDT and deltamethrin in the Central African Republic

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