Giuseppe
Emeritus
The Lancet 2008; 372:398-405 - DOI:10.1016/S0140-6736(08)61160-5 - Articles
Influenza vaccination and risk of community-acquired pneumonia in immunocompetent elderly people: a population-based, nested case-control study
Dr Michael L Jackson PhD a , Jennifer C Nelson PhD a b, Prof Noel S Weiss MD c e, Kathleen M Neuzil MD d f, Prof William Barlow PhD a b and Prof Lisa A Jackson MD a c
Summary
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.
Affiliations
a. Group Health Center for Health Studies, Seattle, WA, USA
b. Department of Biostatistics, University of Washington, Seattle, WA, USA
c. Department of Epidemiology, University of Washington, Seattle, WA, USA
d. Department of Medicine, University of Washington, Seattle, WA, USA
e. Fred Hutchinson Cancer Research Center, Seattle WA, USA
f. PATH, Seattle, WA, USA
Correspondence to: Dr Michael L Jackson, Group Health Center for Health Studies, 1730 Minor Ave Suite 1600, Seattle, WA 98101-1448, USA
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http://www.thelancet.com/journals/lancet/article/PIIS0140673608611605/abstract
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Influenza vaccination and risk of community-acquired pneumonia in immunocompetent elderly people: a population-based, nested case-control study
Dr Michael L Jackson PhD a , Jennifer C Nelson PhD a b, Prof Noel S Weiss MD c e, Kathleen M Neuzil MD d f, Prof William Barlow PhD a b and Prof Lisa A Jackson MD a c
Summary
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.
Affiliations
a. Group Health Center for Health Studies, Seattle, WA, USA
b. Department of Biostatistics, University of Washington, Seattle, WA, USA
c. Department of Epidemiology, University of Washington, Seattle, WA, USA
d. Department of Medicine, University of Washington, Seattle, WA, USA
e. Fred Hutchinson Cancer Research Center, Seattle WA, USA
f. PATH, Seattle, WA, USA
Correspondence to: Dr Michael L Jackson, Group Health Center for Health Studies, 1730 Minor Ave Suite 1600, Seattle, WA 98101-1448, USA
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http://www.thelancet.com/journals/lancet/article/PIIS0140673608611605/abstract
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