Group | Subgroup (DNA vaccine) | Protection against H5N1 virus challenge (20LD50) | ||
---|---|---|---|---|
 |  | Survival rate (survival number/total) | Body weight loss (% of the original) | Lung virus titers (log10TCID50/ml) |
Unexposed to H1N1 | NP DNA | 4/11* | 18.4 ± 1.02 | 9.93 ± 0.26 |
 | M1 DNA | 1/12 | 27.8 ± 2.86 | 10.25 ± 0.35 |
 | NP+M1 DNAs | 3/12 | 20.2 ± 0.54 | 8.96 ± 0.66 |
 | Unimmunized | 0/12 | 26.1 ± 1.76 | 10.85 ± 0.21 |
Pre-exposed to H1N1 | NP DNA | 10/12a, b | 8.5 ± 2.01a, b | 6.43 ± 0.84a, b |
 | M1 DNA | 4/12 | 20.1 ± 2.63a, | 10.05 ± 0.07 |
 | NP+M1 DNAs | 12/12a, b | 7.9 ± 0.72a, b | 7.12 ± 0.17a, b |
 | Unimmunized | 4/12a | 17.8 ± 1.29a | 9.78 ± 1.39 |