Table 1 Efficacy of mass trapping of Anopheles mosquitoes in indoor and outdoor activities. The relative density of primary and secondary malaria vectors collected/captured per night was reduced in the intervention village following the implementation of odour-baited mass trapping
Season | Collection method | Anopheles spp. | Mean pre-intervention density | Mean intervention density | Relative% red’n (95% CI) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Int. village | Con. village | F | P-value | Int. village | Con. village | F | P-value | ||||
Long rains | CDC indoors | An. arabiensis | 3.2 | 5.6 | 1.2 | 0.30 | 2 | 6.9 | 9.7 | 0.006 | 49 (41.3–55.7) |
An. pharoensis | 1.4 | 0.5 | 1.5 | 0.24 | 0.4 | 0.2 | 2.1 | 0.16 | 5.2 (1.4–13.7) | ||
An. ziemanni | 0.2 | 0.3 | 0.02 | 0.90 | 0.3 | 0.1 | 6.1 | 0.02 | ND | ||
CDC outdoors | An. arabiensis | 1.8 | 2.7 | 2.2 | 0.16 | 1.6 | 5 | 5.6 | 0.03 | 54.2 (41.4–59.3) | |
An. pharoensis | 1.6 | 0.3 | 0.001 | 0.97 | 0.6 | 0.9 | 0.2 | 0.70 | 88.9 (83.6–94.7) | ||
An. ziemanni | 0.7 | 1.2 | 0.6 | 0.44 | 0.5 | 0.1 | 0.03 | 0.86 | ND | ||
PSC | An. arabiensis | 7·8 | 6·2 | 0·1 | 0·72 | 4·1 | 15 | 4·4 | 0.04 | 78 (74.7–86.4) | |
Short rains | CDC indoors | An. arabiensis | 1.4 | 3.67 | 1.3 | 0.27 | 1.1 | 3.5 | 9.4 | 0.006 | 16.7 (9.5–21.8) |
An. pharoensis | 1 | 1 | 9.6 | 0.01 | 0.4 | 0.4 | 1.1 | 0.32 | ND | ||
An. ziemanni | 0.5 | 0.4 | 1.01 | 0.34 | 0.7 | 0.8 | 11.7 | 0.003 | 43.5 (35.5–47.6) | ||
CDC outdoors | An. arabiensis | 0.3 | 0.6 | 2.1 | 0.16 | 0.9 | 2.5 | 5.6 | 0.03 | 36 (31.2–43.8) | |
An. pharoensis | 0.9 | 1.2 | 0.3 | 0.62 | 1.2 | 1.4 | 0.1 | 0.77 | ND | ||
An. ziemanni | 1 | 1.2 | 0.3 | 0.57 | 2.9 | 1.3 | 4 | 0.06 | ND | ||
PSC | An. arabiensis | 3 | 1.2 | 2.4 | 0.14 | 2.6 | 3.6 | 0.1 | 0.75 | 71.8 | |