Table. Vaccine effectiveness against laboratory-confirmed influenza among US military basic trainees, 2005–06*†.
| Site | Vaccinated person-weeks | Unvaccinated person-weeks | Cases in vaccinated trainees | Cases in unvaccinated trainees | Vaccine effectiveness (%) | 95% CI |
|---|---|---|---|---|---|---|
| Fort Jackson, SC | 77,874 | 25,958 | 7 | 13 | 82.1 | |
| Fort Wood, MO | 67,513 | 22,504 | 2 | 11 | 93.9 | |
| Fort Benning, GA | 68,652 | 22,884 | 3 | 0 | – | |
| Lackland AFB, TX | 37,435 | 18,690 | 1 | 10 | 95.0 | |
| NSTC Great Lakes, IL | 67,763 | 22,588 | 0 | 13 | 100.0 | |
| MCRD San Diego, CA | 35,490 | 11,830 | 0 | 10 | 100.0 | |
| Total | 354,727 | 124,454 | 13 | 57 | 92.0 | (85.4%, 95.6%) |
*CI, confidence interval; SC, South Carolina; MO, Missouri; GA, Georgia; AFB, Air Force base; TX, Texas; NSTC, Naval Service Training Command; IL, Illinois; MCRD, Marine Corps Recruit Depot; CA, California. †Assuming 14 d before vaccine is protective.