Table 1.
Quantity and Size Distribution of Respiratory Virus–laden Particles in Air Sampled From a University Campus
| Detection of Respiratory Virus RNA in the 3 Size Fractions of NIOSH Samplers | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Measurements | Total | >4 μm | 1–4 μm | <1 μm | >4 μm and 1–4 μm | >4 μm and <1 μm | 1–4 μm and <1 μm | All Size Fractions | Undetermined |
| Influenza A virus | |||||||||
| No. of rRT-qPCR–positive samples | 117/694 | 31 | 31 | 34 | 3 | 12 | 5 | 1 | 0 |
| No. of quantifiable samples | 27/117 | 8 | 3 | 11 | 0 | 4 | 1 | 0 | … |
| Median gene copies/m3 | 20 400 | 20 878 | 12 910 | 23 318 | … | 20 043 | 8378 | … | … |
| Influenza B virus | |||||||||
| No. of rRT-qPCR–positive samples | 31/694 | 11 | 11 | 7 | 1 | 1 | 0 | 0 | 0 |
| No. of quantifiable samples | 6/31 | 4 | 1 | 1 | 0 | 0 | … | … | … |
| Median gene copies/m3 | 14 696 | 17 057 | 9877 | 10 071 | … | … | … | … | … |
| Human rhinovirus | |||||||||
| No. of rRT-qPCR–positive samples | 6/270 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
| No. of quantifiable samples | 0/3 | 0 | … | … | … | … | … | … | 0 |
| Median gene copies/m3 | … | … | … | … | … | … | … | … | … |
| Respiratory syncytial virus | |||||||||
| No. of rRT-qPCR–positive samples | 1/270 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| No. of quantifiable samples | 0/1 | … | … | … | … | … | … | … | 0 |
| Median gene copies/m3 | … | … | … | … | … | … | … | … | … |
| Human coronavirus 229E/OC43 | |||||||||
| No. of rRT-qPCR–positive samples | 0/270 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| No. of quantifiable samples | … | … | … | … | … | … | … | … | … |
| Median gene copies/m3 | … | … | … | … | … | … | … | … | … |
Abbreviations: NIOSH, National Institute for Occupational Safety and Health; rRT-qPCR, quantitative real-time reverse-transcription polymerase chain reaction.