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Observational studies have found that influenza vaccination reduces all-cause mortality and hospitalization among older adults. In this study, researchers assessed the effect of influenza vaccination on mortality among adults hospitalized for community-acquired pneumonia (CAP). In 34 hospitals, 17,393 consecutive adults (mean age, 71) were admitted with CAP during the four influenza seasons from 1999 to 2003. Influenza vaccination status was determined for 8251 subjects (1590 vaccinated, 6661 not vaccinated).
All-cause mortality during hospitalization was 7% among the entire cohort. Subjects who had been vaccinated had a significantly lower mortality rate than those who had not been vaccinated (odds ratio, 0.30) and those whose vaccination s…