Table 1.
Overall serologic results from the three groups of patients.
| Group of patients | Group 1 (negative controls) | Group 2 (PCR positive) | Group 3 (pneumonia of unknown etiology and negative PCR) |
|---|---|---|---|
| No. patients | 100 | 90 | 61 |
| Age (years) | 50 (33−65) | 64 (55−79) | 67 (57−73) |
| Sex (male) | 55 (55.0 %) | 52 (57.8 %) | 45 (73.8 %) |
| Time from onset of symptoms (days) | Not applicable | 17 (9−25) | 17 (15−20) |
| IgG positive | 0 (0%) | 54 (60.0 %) | 54 (88.5 %) |
| IgM positive | 0 (0%) | 25 (28.9 %) | 23 (37.7 %) |
| Positive result | 0 (0%) | 58 (64.4 %) | 54 (88.5 %) |
Statistics: values are expressed as median (interquartile range) and absolute count (percentage). A positive serologic result was defined for samples that resulted positive for either IgM or IgG antibodies.