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1 October 1995 | Volume 123 Issue 7 | Pages 518-527
Objective: To quantify the protective efficacy of influenza vaccine in elderly persons.
Data Sources: A MEDLINE search was done using the index terms influenza vaccine, vaccine efficacy, elderly, mortality, hospitalized, and pneumonia. Appropriate references in the initially selected articles were also reviewed.
Study Selection: Only cohort observational studies with mortality assessment were included in the meta-analysis. In addition, 3 recent case–control studies, 2 cost-effectiveness studies, and 1 randomized, double-blind, placebo-controlled trial were reviewed.
Data Extraction: Vaccine and epidemic virus strains, age and sex of patients, severity of illness, patient status, and study design were recorded. Upper respiratory illness, hospitalization, pneumonia, and mortality were used as outcome measures.
Data Synthesis: In a meta-analysis of 20 cohort studies, the pooled estimates of vaccine efficacy (1 –odds ratio) were 56% (95% CI, 39% to 68%) for preventing respiratory illness, 53% (CI, 35% to 66%) for preventing pneumonia, 50% (CI, 28% to 65%) for preventing hospitalization, and 68% (CI, 56% to 76%) for preventing death.
Vaccine efficacy in the case–control studies ranged from 32% to 45% for preventing hospitalization for pneumonia, from 31% to 65% for preventing hospital deaths from pneumonia and influenza, from 43% to 50% for preventing hospital deaths from all respiratory conditions, and from 27% to 30% for preventing deaths from all causes. The randomized, double-blind, placebo-controlled trial showed a 50% or greater reduction in influenza-related illness. Recent cost-effectiveness studies confirm the efficacy of influenza vaccine in reducing influenza-related morbidity and mortality and show that vaccine provides important cost savings per year per vaccinated person.
Conclusion: Despite the paucity of randomized trials, many studies confirm that influenza vaccine reduces the risks for pneumonia, hospitalization, and death in elderly persons during an influenza epidemic if the vaccine strain is identical or similar to the epidemic strain. Influenza immunization is an indispensable part of the care of persons 65 years of age and older. Annual vaccine administration requires the attention of all physicians and public health organizations.
Author and Article Information
From Hackensack Medical Center, Hackensack, New Jersey; New Jersey Medical School, Newark, New Jersey; Mt. Sinai Medical Center, New York, New York; Tufts-New England Medical Center, Boston, Massachusetts; and the Food and Drug Administration, Bethesda, Maryland.
REVIEW
The Efficacy of Influenza Vaccine in Elderly Persons
A Meta-Analysis and Review of the Literature
Acknowledgments: The authors thank Mark Solomon for manuscript preparation and Duressa Pujat for reference services.
Grant Support: In part by the Center for Biologics Evaluation and Research, Food and Drug Administration, Contract 223-90-1102.
Requests for Reprints: Peter A. Gross, MD, Department of Internal Medicine, Hackensack Medical Center, 30 Prospect Avenue, Hackensack, NJ 07601.
Current Author Addresses: Dr. Gross: Department of Internal Medicine, Hackensack Medical Center, 30 Prospect Avenue, Hackensack, NJ 07601.
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