Table 2 Performance of serology and PCR at first visit in patients with MP infection in relation to duration of illness.
Days after onset of illness | MP cases detected by PCR (%) | MP cases detected by serology. Results of the first serum (%) | ||
|---|---|---|---|---|
Negative | Positive | Negative | Positive | |
1 – 7 | 0 | 17 (100) | 10 | 3 (23) |
8 – 14 | 1 | 23 (96) | 8 | 10 (56) |
15 – 21 | 0 | 8 (100) | 0 | 6 (100) |
22 – 28 | 2 | 5 (71) | 5 | 1 (17) |
> 28 | 0 | 8 (100) | 2 | 9 (82) |
Total | 3 | 61 (95) | 25 | 29 (54) |