Table 2 Evolution of malariometric indices across 6 consecutive cross sectional surveys
Cross sectional surveys: Date | S1 04/2004 | S2 12/2004 | S3 04/2005 | S4 12/2005 | S5 04/2006 | S6 12/2006 |
|---|---|---|---|---|---|---|
Participants, N | 1,518 | 2,068 | 2,081 | 2,089 | 2,102 | 2,018 |
Malaria prevalence: n (%) [95%CI] By species: | 178 (11.7) [6.8; 19.5] | 281 (13.6) [8.8 ; 20.5] | 126 (6.1) [3.5; 10.4] | 173 (8.3) [4.6; 14.4] | 116 (5.5) [2.6; 11.5] | 80 (4.0) [2.3; 6.8] |
- P. falciparum | 85 (5.6) | 148 (7.1) | 57 (2.7) | 103 (4.9) | 61(2.9) | 49(2.4) |
- P. vivax | 77 (5.1) | 93 (4.5) | 52 (2.5) | 55 (2.6) | 43 (2.0) | 27 (1.3) |
- P. malariae | 3 (0.2) | 2 (0.1) | 2 (0.1) | 7 (0.3) | 0 (0.0) | 0 (0.0) |
- Mixed infections | 13 (0.9) | 38 (1.8) | 15 (0.7) | 8 (0.4) | 12 (0.6) | 4 (0.2) |
Asymptomatic infections* | 153 (86.0) [66.4; 95.0] | 230 (81.9) [67.7; 90.7] | 97 (77.0) [40.6; 92.4] | 139 (80.3) [70.2; 87.7] | 99 (85.3) [68.0; 94.1] | 68 (85.0) [75.6; 91.21] |
Parasite density/μl (GM)° [95%CI] | ||||||
P. falciparum | 187.9 [129.0–273.7] | 169.0 [124.1–230.1] | 172.6 [112.7–264.4] | 225.0 [149.1–339.7] | 245.0 [154.0–389.8] | 370.5 [205.8–667.0] |
P. vivax | 76.3 [59.7–97.5] | 79.5 [59.8–105.9] | 68.6 [47.9–98.2] | 81.2 [52.1–126.5] | 82.1 [52.7–127.8] | 145.1 [83.5–252.4] |
P. malariae | 140.7 [54.1–365.5] | 81.1 [12.7–515.8] | 148.1) [39.4–557.1] | 93.5 [87.8–99.7] | - | - |
Gametocyte prevalence, n (%) [95%CI] | 65 (4.3) [2.4; 7.4] | 166 (8.0) [3.0; 19.8] | 33 (1.6) [0.7 ; 3.4] | 55 (2.6) [1.5 ; 4.6] | 44 (2.1) [0.9 ; 4.7] | 21 (1.0) [0.4 ; 2.5] |
Malaria prevalence by age group | ||||||
- <9 years | NA | 101 (17.5) [11.3; 26.0] | 54 (10.4) [5.3; 19.6] | 59 (11.5) [6.8; 18.8] | 42 (9.1) [4.2; 18.7] | 28 (6.3) [3.6; 10.8] |
- 10–19 years | 70 (13.6) [7.3; 23.8] | 78 (15.7) [9.3; 25.3] | 35 (6.6) [3.3; 12.6] | 41 (7.9) [3.5; 16.6] | 37 (6.9) [3.1; 14.9] | 28 (5.4) [2.9; 9.8] |
- 20–29 years | 49 (11.8) [6.3; 20.2] | 42 (10.2) [5.9; 17.1] | 10 (2.4) [0.8; 7.0] | 27 (6.1) [3.5; 10.5] | 15 (3.3) [1.2; 9.1] | 9 (2.2) [0.9 ; 4.9] |
- 30–39 years | 30 (11.0) [7.1; 16.7] | 19 (7.5) [3.6; 15.0] | 15 (5.3) [2.7; 10.0] | 23 (7.7) [3.5; 16.3] | 7 (2.5) [0.6; 8.9] | 5 (1.8) [0.7 ; 4.9] |
- 40–49 years | 20 (11.1) [5.8; 20.2] | 27 (13.8) [7.5; 24.2] | 8 (3.9) [1.0; 14.1] | 17 (9.6) [4.4; 19.8] | 10 (4.4) [1.6; 11.9] | 7 (3.2) [1.3; 7.8] |
- ≥ 50 years | 9 (6.8) [2.8; 15.6] | 14 (10.5) [5.2; 20.1] | 4 (3.1) [1.3; 7.5] | 6 (4.3) [1.8; 10.2] | 5 (3.5) [1.2; 9.8] | 3 (2.0) [0.6; 6.7] |
Spleen rate | 29 (1.9) [6.8; 19.3] | 7 (0.3) [8.8; 20.5] | 4 (0.2) [3.5; 10.4] | 5 (0.2) [4.6; 14.4] | 4 (0.2) [2] | 4 (0.2) [2.3; 6.8] |