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- Title
Evidence of bias in estimates of influenza vaccine effectiveness in seniors.
- Authors
Jackson, Lisa A; Jackson, Michael L; Nelson, Jennifer C; Neuzil, Kathleen M; Weiss, Noel S
- Abstract
Numerous observational studies have reported that seniors who receive influenza vaccine are at substantially lower risk of death and hospitalization during the influenza season than unvaccinated seniors. These estimates could be influenced by differences in underlying health status between the vaccinated and unvaccinated groups. Since a protective effect of vaccination should be specific to influenza season, evaluation of non-influenza periods could indicate the possible contribution of bias to the estimates observed during influenza season.
- Publication
International journal of epidemiology, 2006, Vol 35, Issue 2, p337
- ISSN
0300-5771
- Publication type
Journal Article
- DOI
10.1093/ije/dyi274