Table 1.
Effect of organic load on inactivation of bacteria and viruses in the wet state by low‐concentration ClO2 gas
| Exposure time (h) | FBS concentration in microbes suspension (%) | Bacteria survival (log10 CFU per dish) | Viruses infectivity (log10[TCID50 per 50 μl]) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Escherichia coli | Staphylococcus aureus | Flu‐A | FCV | ||||||
| Air | ClO2 | Air | ClO2 | Air | ClO2 | Air | ClO2 | ||
| 5 | 0 | 4·9 | 1·1 (3·9)* | 6·0 | 2·1 (3·9)* | 5·6 | <0·5 (5·1)* | 5·0 | 2·3 (2·7)* |
| 0·1 | 4·9 | 1·1 (3·8)* | 6·1 | 3·3 (2·8)* | 6·3 | <0·5 (5·8)* | 5·1 | 2·6 (2·5) * | |
| 0·25 | 4·8 | 2·2 (2·7)* | 6·1 | 4·4 (1·7) | 6·4 | 0·6 (5·8)* | 5·4 | 3·1 (2·3)* | |
| 0·5 | 4·7 | 1·3 (3·5)* | 6·2 | 4·4 (1·8) | 6·3 | <0·5 (5·8)* | 5·3 | 3·6 (1·8) | |
| 0·75 | 4·7 | 2·3 (2·4)* | 6·3 | 5·0 (1·3) | 6·2 | <0·5 (5·7)* | 5·2 | 4·8 (0·4) | |
| 1 | 4·9 | 2·0 (2·8)* | 6·1 | 5·1 (1·0) | 6·3 | 0·6 (5·7)* | 5·3 | 5·3 (0·0) | |
CFU, colony‐forming units; TCID, tissue culture infectious dose.
Values are the mean of four experiments.
The values given in parentheses show log10 reduction.
*Values indicate reductions of >2 log10 as compared with control values (in ordinary air).