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J Infect Dis. 2015 Apr 1;211(7):1045-50. doi: 10.1093/infdis/jiu578. Epub 2014 Oct 21.

Influenza vaccine prevents medically attended influenza-associated acute respiratory illness in adults aged ≥50 years.

Author information

1
Department of Biostatistics Department of Biomedical Informatics, Vanderbilt University Medical Center.
2
Department of Preventive Medicine Department of Medicine Department of Mid-South Geriatric Research Education and Clinical Center Department of Clinical Research Center of Excellence, VA Tennessee Valley Health Care System, Nashville, Tennessee.
3
Department of Biostatistics.
4
Department of Pediatrics Department of Microbiology and Immunology.
5
Department of Pediatrics.
6
Department of Medicine.

Abstract

BACKGROUND:

There are few estimates of effectiveness influenza vaccine in preventing serious outcomes due to influenza in older adults.

METHODS:

Adults aged ≥50 years who sought medical care for acute respiratory illness were enrolled. A nose/throat swab was tested for influenza virus by reverse transcription-polymerase chain reaction. Clinical and demographic data were collected, including verification of receipt of trivalent inactivated influenza vaccination (IIV-3). Adjusted odds ratios were estimated by multivariable logistic regression models with an L1 penalty on all covariates except vaccination status.

RESULTS:

A total of 1047 subjects were enrolled from November through April during 5 influenza seasons during 2006-2012, excluding the 2009-2010 season. Of those enrolled, 927 (88%) had complete influenza virus testing, vaccination status, and demographic data obtained. Of 86 (9.3%) influenza virus-positive patients, 47 (55%) were vaccinated. Of 841 influenza virus-negative patients, 646 (76.8%) were vaccinated. Over 5 influenza seasons, IIV-3 was 58.4% effective (95% confidence interval [CI], 37.0%-75.6%) for the prevention of medically attended laboratory-confirmed influenza illness in adults aged ≥50 years and 58.4% effective (95% CI, 7.9%-81.1%) in adults aged ≥65 years.

CONCLUSIONS:

Influenza vaccine was moderately effective in preventing influenza-associated medical care visits in older adults.

KEYWORDS:

control-negative; elderly; influenza vaccine effectiveness; older adults

PMID:
25336724
PMCID:
PMC4432432
DOI:
10.1093/infdis/jiu578
[Indexed for MEDLINE]
Free PMC Article

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