Table 3.
Serologic results in group 3 patients (pneumonia of unknown etiology and negative PCR) according to the time from the onset of symptoms.
| Time from onset of symptoms | Overall | < 7 days | 8−14 days | 15−21 days | 22−28 days | > 28 days |
|---|---|---|---|---|---|---|
| No. patients | 61 (100.0 %) |
0 (0.0 %) |
15 (24.6 %) |
31 (50.8 %) |
14 (23.3 %) |
1 (1.7 %) |
| IgG positive | 54 (88.5 %) |
– | 13 (86.7 %) |
30 (96.8 %) |
10 (71.4 %) |
1 (100.0 %) |
| IgM positive | 23 (37.7 %) |
– | 5 (33.3 %) |
14 (45.2 %) |
4 (28.6 %) |
0 (0.0 %) |
| Positive result | 54 (88.5 %) |
– | 13 (86.7 %) |
30 (96.8 %) |
10 (71.4 %) |
1 (100.0 %) |
Statistics: values are expressed as absolute count (percentage). A positive serologic result was defined for samples that resulted positive for either IgM or IgG antibodies.