Table 3 Efficacy of the mass trapping of Anopheles mosquitoes on the seasonal malaria prevalence. Malaria cases per individual tested (prevalence per 1000 people) are reported for the intervention village, in reference to the control village, before and after the intervention

Long rains

P. falciparum

3/240 (12.5)

6/229 (26.2)

10/242 (41.3)

49/232 (211.2)

59% (51.7–64.5)

P. vivax

5/240 (20.8)

4/229 (17.5)

6/242 (24.8)

4/232 (17.2)

− 21%

Mixed

0

0

2/242 (8.3)

5/232 (21.6)

ND

Total

8/240 (33.3)

10/229 (43.7)

18/242 (74.4)

58/232 (250)

61% (54.3–66.8)

Short rains

P. falciparum

11/237 (46.4)

9/219 (41.1)

11/220 (50)

13/203 (64)

31% (25.7–35.4)

P. vivax

5/237 (21.1)

5/219 (22.8)

7/220 (31.8)

12/203 (59.1)

42% (37–46.8)

Mixed

0

0

0

3/203 (14.8)

ND

Total

16/237 (67.5)

14/219 (63.9)

17/220 (81.8)

28/203 (137.9)

44% (40.3–47.6)

Dry season

P. falciparum

5/487 (10.3)

2/482 (4.1)

12/228 (52.6)

14/210 (66.7)

68.6% (64.2–72.7)

P. vivax

5/487 (10.3)

4/482 (8.3)

5/228 (21.9)

12/210 (57.1)

69.1% (66.4–73.4)

Mixed

0

0

0

0

ND

Total

10/484 (20.5)

6/482 (12.4)

17/228 (74.6)

26/210 (123.8)

63.5% (58.8–67.4)

Overall period

P. falciparum

19/964 (19.7)

17/930 (18.3)

33/690 (47.8)

76/645 (117.8)

62.3% (54.3–67.4)

P. vivax

15/964 (15.6)

13/930 (14)

18/690 (26.1)

28/645 (43.4)

46% (42.6–49.5)

Mixed

0

0

2/690 (2.9)

8/645 (12.4)

ND

Total

34/964 (35.3)

30/930 (32.3)

53/690 (76.8)

112/645 (173.6)

59.6% (55–63)