Table 2.
Immunogenicity of inactivated influenza vaccine
| Group (n) | Mean age (years) | Serum HI antibody responses to the following antigens | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| H1N1 responses | H3N2 responses | B responses | ||||||||
| Log 2 HI±SD | % Responding | Log 2 HI±SD | % Responding | Log 2 HI±SD | % Responding | |||||
| Pre | Post | Pre | Post | Pre | Post | |||||
| Healthy adults (52) | 34 | 5.1±2.0 | 6.7±1.7 | 50 | 4.9±1.5 | 6.7±1.7 | 48 | 5.9±1.6 | 7.9±1.8 | 54 |
| Healthy elderly (52) | 75 | 4.2±1.3 | 5.3±1.8 | 25 | 4.0±1.3 | 4.8±1.6 | 25 | 5.9±1.4 | 6.9±1.6 | 23 |
| Nursing home elderly (46) | 85 | 4.5±1.3 | 5.5±1.8 | 33 | 4.2±1.5 | 5.3±2.0 | 32 | 5.3±1.8 | 6.3±2.0 | 26 |