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The observed attack rates, measured ventilation rates, and exposure times in the two buses.
| Parameters | Bus B1 from Changsha to city D (12:10 p.m. to 3:30 p.m.) | Minibus B2 (15:43 p.m. to 16:43 p.m.) |
|---|---|---|
| Number of persons (other passengers + driver (conductor)) | 46 | 17 |
| Number of infected cases except index case | 7 | 2 |
| Attack rate (%) | 7/46, 15.2% | 2/17, 11.8% |
| Ventilation rate | 1.72 L/s per person | 3.22 L/s per person |
| Exposure time | 200 min | 60 min |
