Table 6.
Airfuge concentration of spores or virus particles on grids in relation to particle concentration of the sample suspension applied
| Concentration (part per ml) | Particles/22 squares | Interquartile range | Particles/square* | Interquartile range | No. Grids |
|---|---|---|---|---|---|
| Spores | |||||
| 107 | 459 | 125 | 21 | 6 | 2 |
| 106 | 56 | 18 | 3 | 0.8 | 3 |
| 105 | 8 | 3 | 0.4 | 0.1 | 3 |
| 5 × 104 | 4 | 0.5 | 0.2 | 0.02 | 3 |
| 104 | 2 | 2 | 0.07 | 0.08 | 6 |
| Virus | |||||
| 106 | 340 | 26 | 15 | 1 | 3 |
| 105 | 34 | 26 | 2 | 1 | 3 |
| 5 × 104 | 10 | 2 | 0.5 | 0.07 | 3 |
| 104 | 3 | 2 | 0.1 | 0.09 | 3 |
*Value for each grid was calculated from respective number counted for 22 grid squares.