Days of specimen collection after onset of illness | No. of specimens | No. of specimens with the following resultsa: | Sensitivity | Specificity | |||
---|---|---|---|---|---|---|---|
P+,C+ | P+,C- | P-,C+ | P-,C- | (%) | (%) | ||
1 | 48 | 13 | 2 | 0 | 33 | 86.7 | 100 |
2 | 77 | 16 | 5 | 0 | 56 | 76.2 | 100 |
3 | 38 | 7 | 1 | 0 | 30 | 87.5 | 100 |
4 | 25 | 3 | 3 | 1 | 18 | 50 | 94.7 |
> 4 | 36 | 3 | 9 | 0 | 24 | 25 | 100 |
1-7 | 224 | 42 | 20 | 1 | 161 | 67.7 | 99.4 |