Table 2.
Parasitological characteristics of the asymptomatic Plasmodium falciparum infections collected at the end of the wet (Survey 1) and dry (Survey 2) seasons
| Characteristic | Survey 1: End of wet season (October 2012) |
Survey 2: End of dry season (June 2013) |
||||
|---|---|---|---|---|---|---|
| Total | Vea/Gowrie | Soe | Total | Vea/Gowrie | Soe | |
| Microscopic P. falciparum prevalence | ||||||
| Number of participants* | 1,900 (100) | 901 (100) | 999 (100) | 1,868 (100) | 910 (100) | 958 (100) |
| Age groups† | ||||||
| All | 808 (42.5) | 356 (39.5) | 452 (45.2) | 513 (27.5) | 255 (28.0) | 258 (26.9) |
| 1–5 years | 174 (49.2) | 64 (40.0) | 110 (56.7) | 102 (29.4) | 44 (27.2) | 58 (31.4) |
| 6–10 years | 244 (62.4) | 106 (57.9) | 138 (66.3) | 167 (42.1) | 82 (42.5) | 85 (41.7) |
| 11–20 years | 200 (49.4) | 96 (47.3) | 104 (51.5) | 159 (40.3) | 86 (41.5) | 73 (38.8) |
| 21–39 years | 84 (26.2) | 40 (26.5) | 44 (25.9) | 38 (12.3) | 23 (15.8) | 15 (9.1) |
| ≥ 40 years | 106 (24.7) | 50 (24.5) | 56 (24.9) | 47 (11.2) | 20 (9.9) | 27 (12.4) |
| Gender† | ||||||
| Female | 380 (37.4) | 159 (33.9) | 221 (45.2) | 240 (23.2) | 120 (24.3) | 120 (22.2) |
| Male | 428 (48.4) | 197 (45.6) | 231 (51.1) | 273 (32.7) | 135 (32.5) | 138 (33.0) |
| P. falciparum median density‡ | ||||||
| Age groups | ||||||
| All | 520 [160–1,640] | 360 [160–1,200] | 680 [200–2,190] | 160 [80–560] | 160 [80–520] | 200 [80–600] |
| 1–5 years | 1,600 [360–9,860] | 1,040 [240–3,320] | 1,820 [580–13,510] | 440 [120–1,270] | 460 [130–1,180] | 420 [120–1,380] |
| 6–10 years | 760 [240–1,900] | 520 [200–1,370] | 900 [280–3,120] | 240 [120–680] | 280 [120–680] | 240 [120–780] |
| 11–20 years | 320 [130–760] | 280 [160–720] | 360 [120–820] | 120 [80–400] | 120 [80–240] | 160 [80–500] |
| 21–39 years | 200 [120–720] | 200 [120–540] | 200 [130–880] | 120 [40–170] | 120 [80–280] | 80 [40–160] |
| ≥ 40 years | 200 [120–680] | 200 [120–560] | 260 [120–260] | 80 [40–160] | 80 [40–150] | 80 [40–160] |
| Gender | ||||||
| Female | 520 [160–1,630] | 400 [160–1,400] | 640 [200–1,840] | 160 [80–480] | 160 [80–500] | 160 [50–480] |
| Male | 500 [160–1,670] | 320 [160–1,000] | 680 [160–2,760] | 200 [100–600] | 160 [80–520] | 220 [120–740] |
| Submicroscopic P. falciparum prevalence | ||||||
| Number of participants§ | 1,092 (100) | 545 (100) | 547 (100) | 1,355 (100) | 655 (100) | 700 (100) |
| Age groups‖ | ||||||
| All | 605 (55.4) | 254 (46.6) | 351 (64.2) | 280 (20.7) | 122 (18.6) | 158 (22.6) |
| 1–5 years | 80 (44.4) | 29 (30.2) | 51 (60.7) | 21 (8.6) | 8 (6.8) | 13 (10.2) |
| 6–10 years | 90 (61.2) | 45 (58.4) | 45 (64.3) | 58 (25.2) | 24 (21.6) | 34 (28.6) |
| 11–20 years | 143 (69.8) | 66 (61.7) | 77 (78.6) | 89 (37.7) | 45 (37.2) | 44 (38.3) |
| 21–39 years | 127 (53.6) | 51 (45.9) | 76 (60.3) | 51 (18.8) | 20 (16.3) | 31 (20.8) |
| ≥ 40 years | 165 (51.1) | 63 (40.9) | 102 (60.4) | 61 (16.4) | 25 (13.7) | 36 (18.9) |
| Gender‖ | ||||||
| Female | 335 (52.7) | 136 (43.9) | 199 (61.0) | 139 (17.5) | 63 (16.8) | 76 (18.1) |
| Male | 270 (59.2) | 118 (50.2) | 152 (68.8) | 141 (25.1) | 59 (21.0) | 82 (29.3) |
Number of participants sampled that were analyzed by microscopy.
Data reflect no. (% [n/N]) of participants sampled that were microscopically positive for P. falciparum (including mixed P. falciparum infections).
Median parasite density for microscopically positive P. falciparum (including mixed P. falciparum infections) (value/μL, interquartile range [IQR]) samples.
Number of microscopically negative samples that were analyzed by 18S rRNA polymerase chain reaction (PCR).
Data reflect no. (% [n/N]) of microscopically negative samples that were 18S rRNA PCR positive for P. falciparum (including mixed P. falciparum infections).