Table 1 Thin film sensitivity and other factors by parasite density
From: Pilot assessment of the sensitivity of the malaria thin film
Sensitivity | Time to 1st Parasite | Field to 1st Parasite | % Typical 1st | RBC's Field 1st Parasite | Time to 2nd Parasite | Field to 2nd Parasite | % Typical 2nd | RBC's Field 2nd Parasite | Total Parasites | Total Fields | Total Time | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Parasite | (95% CI) | ||||||||||||
Densiy | n | ||||||||||||
< 100 | 45 | 40% (25–55%) | 6.5 ± 3.7* (12)** | 155 ± 150 | 98 ± 6 | 195 ± 71 | 5.8 ± 5.4 | 245 ± 163 | 45 ± 52 | 103 ± 117 | 0.7 ± 1.3 | 475 ± 213 | 22 ± 10 |
101–200 | 50 | 46% (32–60%) | 8.3 ± 7.7 (20) | 194 ± 198 | 100 ± 1 | 199 ± 67 | 8.4 ± 4.4 | 268 ± 151 | 61 ± 50 | 146 ± 127 | 0.7 ± 1.1 | 455 ± 199 | 19 ± 8 |
201–300 | 15 | 87% (67–106%) | 5.3 ± 3.4 (10) | 139 ± 115 | 99 ± 3 | 188 ± 89 | 4.3 ± 2.0 | 85 ± 50 | 100 ± 1 | 162 ± 83 | 4.8 ± 3.5 | 490 ± 234 | 25 ± 12 |
301–500 | 15 | 93% (79–108%) | 2.9 ± 1.7 (6) | 69 ± 78 | 100 ± 1 | 237 ± 80 | 4.3 ± 3.3 | 59 ± 45 | 100 ± 1 | 257 ± 88 | 5.2 ± 3.8 | 475 ± 174 | 24 ± 13 |
501–1000 | 15 | 100% (NA) | 4.2 ± 5.5 (20) | 35 ± 32 | 98 ± 4 | 187 ± 48 | 3.3 ± 3.0 | 33 ± 28 | 99 ± 3 | 198 ± 59 | 8.1 ± 3.8 | 352 ± 214 | 24 ± 10 |
1001–2000 | 20 | 100% (NA) | 2.7 ± 3.4 (11) | 32 ± 39 | 99 ± 3 | 194 ± 78 | 3.8 ± 6.6 | 29 ± 33 | 98 ± 4 | 195 ± 79 | 9.2 ± 2.9 | 225 ± 134 | 17 ± 6 |
>2000 | 20 | 100% (NA) | 4.2 ± 3.4 (11) | 30 ± 59 | 98 ± 3 | 176 ± 57 | 3.2 ± 3.2 | 15 ± 15 | 99 ± 4 | 192 ± 68 | 10.4 ± 2.4 | 147 ± 82 | 25 ± 9 |
Total | 180 | 68% (61–75%) | 5.9 ± 5.5 (15) | 113 ± 133 | 99 ± 3 | 203 ± 73 | 5.0 ± 4.8 | 97 ± 130 | 89 ± 29 | 192 ± 93 | 2.8 ± 4.0 | 412 ± 204 | 20 ± 10 |