Open AccessA Cohort Study of the Effectiveness of Influenza Vaccine in Older People, Performed Using the United Kingdom General Practice Research Database
Author(s) -
Punam Mangtani,
Phillippa Cumberland,
Cathy R. Hodgson,
Jennifer Roberts,
Felicity Cutts,
Andrew J. Hall
Publication year - 2004
Publication title -
the journal of infectious diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.69
H-Index - 252
eISSN - 1537-6613
pISSN - 0022-1899
DOI - 10.1086/421274
Subject(s) - medicine , cohort , cohort study , database , family medicine , virology , computer science , pathology
The effectiveness of influenza vaccination against hospitalization and death can only ethically be assessed in observational studies. A concern is that individuals who are vaccinated are healthier than individuals who are not vaccinated, potentially biasing estimates of effectiveness upward.
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