Table 3.
Concentration and detection of SARS-CoV from 25,000- or 50,000-ml sewage in Xiao Tang Shan Hospital
| Date | Patients in hospital | Patientsb with symptoms | f2 input | f2 recovered (%) | Cell culture | Concentrate + PCR | Inoculated cell + PCR | Residual chlorinea |
|
|---|---|---|---|---|---|---|---|---|---|
| Total | Free | ||||||||
| 11 Junec | 179 | 12 | 2.8 × 106 | 100.0 | – | – | – | 1.0 | 0.5 |
| 12 June | 145 | 8 | 3.5 × 106 | 69.5 | – | – | – | 1.0 | 0.5 |
| 13 June | 112 | 6 | 1.4 × 106 | 57.1 | – | – | – | 1.0 | 0.5 |
| 14 June | 89 | 4 | 3.5 × 106 | 51.2 | – | – | – | 1.0 | 0.2 |
| 15 June | 88 | 3 | 3.4 × 107 | 13.5 | – | – | – | 0.0 | 0.0 |
a
Residual chlorine (mg/l): total, total residual chlorine; free, free residual chlorine.
b
With any one of the symptoms of fever, malaise, cough, dyspnea except chest radiography signs.
c
Volume of sewage was 50,000 ml.