Table 2. Inactivation of HPAI (H5N1) virus by free chlorine at 5°C*.
| Strain | pH | Time, s | Free chlorine, mg/L | Virus titer log10 TCID50/mL | Log10 reduction |
|---|---|---|---|---|---|
| Hong Kong† | 7 | 0 | 2.08 | 5.32 | NA |
| 15 | ND | <2.17 | >3.15 | ||
| 30 | 0.65 | <2.17 | >3.15 | ||
| 60 | 0.52 | <2.17 | >3.15 | ||
| 8 | 0 | 2.08 | 5.70 | NA | |
| 15 | ND | 3.88 | 1.82 | ||
| 30 | 0.76 | 2.67 | 3.03 | ||
|
|
|
60 |
0.59 |
<2.17 |
>3.53 |
| Mongolia‡ | 7 | 0 | 1.86 | 5.26 | NA |
| 15 | ND | <2.17 | >3.09 | ||
| 30 | 0.85 | <2.17 | >3.09 | ||
| 60 | 0.77 | <2.17 | >3.09 | ||
| 8 | 0 | 2.04 | 5.53 | NA | |
| 15 | ND | 3.39 | 2.14 | ||
| 30 | 1.10 | <2.17 | >3.36 | ||
| 60 | 1.08 | <2.17 | >3.36 |
*HPAI, highly pathogenic avian influenza; TCID50, median 50% tissue culture infectious dose; NA, not applicable; ND, not determined. †A/chicken/Hong Kong/D-0947/2006. ‡A/WhooperSwan/Mongolia/244/2005.