Insecticide susceptibility status and knockdown resistance (kdr) mutation in Aedes albopictus in China

Parasites & Vectors

Table 2 Knockdown time and mortality rate of Ae. albopictus populations in China using the standard WHO tube resistance bioassay against 0.03% deltamethrin

Population	n	KDT₅₀ (95% CI)	KRR₅₀	KDT₉₅ (95% CI)	KRR₉₅	24-h mortality (95% CI)
Lab	388	18.9 (16.8–20.8)	1.0	47.6 (41.7–56.7)	1.0	99.3% (98.4–100%)
BJ	348	26.0 (23.1–28.7)	1.4	63.8 (54.8–79.0)	1.3	88.0% (84.0–92.0%)
SJZ	327	30.6 (29.3–31.9)	1.6	74.0 (68.4–81.3)	1.6	60.3% (54.0–66.5%)
HZ	362	32.8 (30.1–35.7)	1.7	84.8 (72.4–105.6)	1.8	54.8% (48.7–60.8%)
WH	343	27.7 (26.4–29.0)	1.5	76.2 (69.9–84.4)	1.6	79.8% (74.9–84.8%)
MS	305	31.2 (29.7–32.7)	1.7	87.4 (79.1–98.6)	1.8	69.4% (63.3–75.4%)
GZ	346	81.5 (72.4–96.0)	4.3	306.7 (225.5–474.9)	6.4	33.9% (28.0–39.7%)
ZJ	424	19.8 (17.3–22.2)	1.0	56.2 (48.0–69.8)	1.2	93.5% (90.8–96.2%)
LS	460	39.9 (35.1–46.2)	2.1	117.7 (88.0–198.5)	2.5	56.8% (51.7–61.9%)

KDT₅₀: time in minutes when 50% of the tested mosquitoes were knocked down; 95% CI refers to 95% confidence interval
KRR₅₀: knockdown resistant ratio was calculated as KDT₅₀ of field population divided by KDT₅₀ of laboratory strain;
KDT₉₅: time in minutes when 95% of the tested mosquitoes were knocked down;
KRR₉₅: KRR₉₅ was calculated as the ratio of KDT₉₅ of field population to KDT₉₅ of laboratory strain
Lab, the susceptible laboratory colony; BJ, Beijing; SJZ, Shijiazhuang; HZ, Hangzhou; WH, Wuhan; MS, Meishan; GZ, Guangzhou; ZJ, Zhanjiang; LS, Lingshui

ISSN: 1756-3305