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Influenza vaccination and risk of community-acquired pneumonia in immunocompetent elderly people: a population-based, nested case-control study.

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Title: Influenza vaccination and risk of community-acquired pneumonia in immunocompetent elderly people: a population-based, nested case-control study.
Authors: Jackson ML (AUTHOR), Nelson JC (AUTHOR), Weiss NS (AUTHOR), Neuzil KM (AUTHOR), Barlow W (AUTHOR), Jackson LA (AUTHOR)
Source: Lancet. 8/2/2008, Vol. 372 Issue 9636, p398-405. 8p.
Abstract: BACKGROUND: Pneumonia is a common complication of influenza infection in elderly individuals and could therefore potentially be prevented by influenza vaccination. In studies with data from administrative sources, vaccinated elderly people had a reduced risk of admission for pneumonia compared with unvaccinated seniors; however, these findings could have been biased by underlying differences in health between the groups. Furthermore, since most individuals with pneumonia are not treated in hospital, such studies should include both outpatient and inpatient events. We therefore assessed whether influenza vaccination is associated with a reduced risk of community-acquired pneumonia in immunocompetent elderly people after controlling for health status indicators. METHODS: We did a population-based, nested case-control study in immunocompetent elderly people aged 65-94 years (cases and controls) enrolled in Group Health (a health maintenance organisation) during the 2000, 2001, and 2002 preinfluenza periods and influenza seasons. Cases were individuals with an episode of outpatient or inpatient community-acquired pneumonia (validated by review of medical records or chest radiograph reports). We randomly selected two age-matched and sex-matched controls for each case. The exposure of interest was influenza vaccination. We reviewed medical records to define potential confounders, including smoking history, presence and severity of lung and heart disease, and frailty indicators. FINDINGS: 1173 cases and 2346 controls were included in the study. After we adjusted for the presence and severity of comorbidities, as defined by chart review, influenza vaccination was not associated with a reduced risk of community-acquired pneumonia (odds ratio 0.92, 95% CI 0.77-1.10) during the influenza season. INTERPRETATION: The effect of influenza vaccination on the risk of pneumonia in elderly people during influenza seasons might be less than previously estimated. FUNDING: Group Health Center for Health Studies internal funds and Group Health Community Foundation fellowship grant. [ABSTRACT FROM AUTHOR]
Copyright of Lancet is the property of Lancet and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Influenza vaccination and risk of community-acquired pneumonia in immunocompetent elderly people: a population-based, nested case-control study.
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  Data: <searchLink fieldCode="JN" term="%22Lancet%22">Lancet</searchLink>. 8/2/2008, Vol. 372 Issue 9636, p398-405. 8p.
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  Data: BACKGROUND: Pneumonia is a common complication of influenza infection in elderly individuals and could therefore potentially be prevented by influenza vaccination. In studies with data from administrative sources, vaccinated elderly people had a reduced risk of admission for pneumonia compared with unvaccinated seniors; however, these findings could have been biased by underlying differences in health between the groups. Furthermore, since most individuals with pneumonia are not treated in hospital, such studies should include both outpatient and inpatient events. We therefore assessed whether influenza vaccination is associated with a reduced risk of community-acquired pneumonia in immunocompetent elderly people after controlling for health status indicators. METHODS: We did a population-based, nested case-control study in immunocompetent elderly people aged 65-94 years (cases and controls) enrolled in Group Health (a health maintenance organisation) during the 2000, 2001, and 2002 preinfluenza periods and influenza seasons. Cases were individuals with an episode of outpatient or inpatient community-acquired pneumonia (validated by review of medical records or chest radiograph reports). We randomly selected two age-matched and sex-matched controls for each case. The exposure of interest was influenza vaccination. We reviewed medical records to define potential confounders, including smoking history, presence and severity of lung and heart disease, and frailty indicators. FINDINGS: 1173 cases and 2346 controls were included in the study. After we adjusted for the presence and severity of comorbidities, as defined by chart review, influenza vaccination was not associated with a reduced risk of community-acquired pneumonia (odds ratio 0.92, 95% CI 0.77-1.10) during the influenza season. INTERPRETATION: The effect of influenza vaccination on the risk of pneumonia in elderly people during influenza seasons might be less than previously estimated. FUNDING: Group Health Center for Health Studies internal funds and Group Health Community Foundation fellowship grant. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Lancet is the property of Lancet and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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