Lung lesions score (Mean score ± SD) | ||
Vaccinated group (n = 266) | Control group (n = 257) | |
9.6a ± 6.6 | 12.2b ± 7.8 | |
Pleuritis lesions score (% of total cases examined) | ||
Vaccinated group (n = 279) | Control group (n = 269) | |
No pleurisy lesions* | 77% | 70% |
Topical lesions /spots | 21% | 25% |
More extended lesions | 3% | 5% |