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JAMA. 1993 Oct 27;270(16):1956-61.

Clinical effectiveness of influenza vaccination in Manitoba.

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1
Department of Medicine, University of Virginia School of Medicine, Charlottesville.

Erratum in

  • JAMA 1994 May 25;271(20):1578.

Abstract

OBJECTIVE:

To assess the clinical effectiveness of influenza vaccination in preventing influenza-associated hospitalization and death.

DESIGN:

Case-control study.

SETTING AND PATIENTS:

Noninstitutionalized persons aged 45 years or older living in Manitoba, on December 1, 1982, and December 1, 1985.

METHODS:

Linked records of the Manitoba population registry, hospital-discharge abstracts, physician claims for ambulatory-patient visits and influenza vaccination, and vital statistics were used. A matched-set analysis estimated the clinical effectiveness of influenza vaccination in preventing hospital admissions and deaths from influenza-associated conditions during influenza A (H3N2) outbreak periods in 1982 to 1983 (12 weeks) and 1985 to 1986 (10 weeks). The analysis adjusted for hospital discharge and ambulatory care for high-risk conditions within the previous 15 months and 3 months, respectively.

RESULTS:

Influenza vaccination prevented 32% to 39% of hospital admissions with pneumonia and influenza and 15% to 34% of admissions with all respiratory conditions. Vaccination was 43% to 65% effective in preventing hospital deaths with these conditions (all listed diagnoses) and 27% to 30% effective in preventing deaths from all causes.

CONCLUSION:

Influenza vaccination has substantial clinical effectiveness in preventing hospital admission and death from influenza-associated conditions in noninstitutionalized individuals.

PMID:
8411553
[Indexed for MEDLINE]
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