Table 2.
Parasitological characteristics of cross-sectional survey participants.
| Variable | Overall N = 1199 | 2 to < 5 years N = 155 | 5 to < 10 years N = 244 | 10 to < 15 years N = 150 | 15 to < 20 years N = 117 | > 20 years N = 533 | |
|---|---|---|---|---|---|---|---|
| Plasmodium infection | |||||||
| P. falciparum | n (%) | 393 (32.8) | 36 (23.2) | 131 (53.7) | 85 (56.7) | 44 (37.6) | 97 (18.2) |
| P. malariae | n (%) | 9 (0.8) | 0 | 7 (2.9) | 1 (0.7) | 0 | 1 (0.2) |
| Mixed infection (P. falciparum + P. malariae) | n (%) | 20 (1.7) | 2 (1.3) | 12 (4.9) | 4 (2.7) | 1 (0.9) | 1 (0.2) |
| P. ovale | n (%) | 0 | 0 | 0 | 0 | 0 | 0 |
| P. vivax | n(%) | 0 | 0 | 0 | 0 | 0 | 0 |
| P. falciparum high density (> 5,000 parasites/µL) prevalence, detected by microscopy | n (%) | 40 (3.3)* | 14 (9.0) | 22 (9.0) | 4 (2.7) | 0 | 0 |
| Geometric mean of P. falciparum density per μL | (95%CI) | 573.5 (491.0–669.7) | 3333.9 (1924.2–5776.3) | 882.0 (682.7–1139.5) | 507.9 (385.9–668.4) | 294.9 (200.6–433.6) | 234.3 (182.6–300.6) |
| Gametocyte prevalence P.f (any density) | n (%) | 57 (4.8) | 12 (7.7) | 17 (7.0) | 10 (6.7) | 3 (2.6) | 15 (2.8) |
| Geometric mean P.f gametocytes density per μL | (95% CI) | 31.3 (22.8–43.0) | 66.1 (25.1–174.3) | 40.2 (21.1–76.6) | 20.6 (10.1–41.9) | 35.4 (11.6–108.4) | 16.7 (12.0–23.3) |
|
Fever (body temperature ≥ 37.5 °C or history of fever in the previous 48 h) |
n (%) | 80 (6.7) | 8 (5.2) | 14 (5.7) | 13 (8.7) | 5 (4.3) | 40 (7.5) |
| Prevalence of symptomatic P. falciparum malaria (fever + microscopy positive) | n (%) | 32 (2.7) | 3 (1.9) | 9 (3.7) | 9 (6.0) | 3 (2.6) | 8 (1.5) |
| Prevalence of asymptomatic P. falciparum infection | n (%) | 361 (30.1) | 33 (21.3) | 122 (50.0) | 76 (50.7) | 41 (35.0) | 89 (16.7) |
*2/40 were mixed P.f/P.m infections.