|  | Lung virus titerb (log10 TCID50/ml) | Survival rate (No. of survivors/no. tested) | ||||
---|---|---|---|---|---|---|---|
Plasmid DNA | Dose (μg) | 3 days | 5 days | 7 days | 3 days | 5 days | 7 days |
HA DNA | 10 | 6.25 ± 0.35 | 4.80 ± 0.28c | 4.25 ± 0.35c | 0/12 | 0/12 | 6/12 |
 | 50 | 5.75 ± 0.35 | 4.55 ± 0.07c | 4.00 ± 0.70c | 0/12 | 4/12 | 10/12d |
 | 100 | 5.75 ± 0.35 | 4.55 ± 0.07c | 3.25 ± 0.35c | 0/12 | 6/12 | 12/12d |
Control | 6.25 ± 0.35 | 0/12 |