Effect of influenza vaccination on excess deaths occurring during periods of high circulation of influenza: cohort study in elderly people
OBJECTIVE To estimate the protection against death provided by vaccination against influenza. DESIGN Prospective cohort follow up supplemented by weekly national counts of influenza confirmed in the community. SETTING Primary care. PARTICIPANTS 24,535 patients aged over 75 years from 73 general practices in Great Britain. MAIN OUTCOME MEASURE Death. RESULTS In unvaccinated members of the cohort daily all cause mortality was strongly associated with an index of influenza circulating in the...[Show more]
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