Impact of the 2009 Influenza Pandemic on Pneumococcal Pneumonia Hospitalizations in the United States

Daniel M. Weinberger*, Lone Simonsen, Richard Jordan, Claudia Steiner, Mark Miller, Cecile Viboud

*Corresponding author

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstract

BACKGROUND:
Infection with influenza virus increases the risk for developing pneumococcal disease. The A/H1N1 influenza pandemic in autumn 2009 provided a unique opportunity to evaluate this relationship.

METHODS:
Using weekly age-, state-, and cause-specific hospitalizations from the US State Inpatient Databases of the Healthcare Cost and Utilization Project 2003-2009, we quantified the increase in pneumococcal pneumonia hospitalization rates above a seasonal baseline during the pandemic period.

RESULTS:
We found a significant increase in pneumococcal hospitalizations from late August to mid-December 2009, which corresponded to the timing of highest pandemic influenza activity. Individuals aged 5-19 years, who have a low baseline level of pneumococcal disease, experienced the largest relative increase in pneumococcal hospitalizations (ratio, 1.6 [95% confidence interval {CI}, 1.4-1.7]), whereas the largest absolute increase was observed among individuals aged 40-64 years. In contrast, there was no excess disease in the elderly. Geographical variation in the timing of excess pneumococcal hospitalizations matched geographical patterns for the fall pandemic influenza wave.

CONCLUSIONS:
The 2009 influenza pandemic had a significant impact on the rate of pneumococcal pneumonia hospitalizations, with the magnitude of this effect varying between age groups and states, mirroring observed variations in influenza activity.
OriginalsprogEngelsk
TidsskriftJournal of Infectious Diseases
Vol/bind205
Udgave nummer3
Sider (fra-til)458-465
ISSN0022-1899
DOI
StatusUdgivet - feb. 2012
Udgivet eksterntJa

Bibliografisk note

This article has been found as a ’Free Version’ from the Publisher on June 23 2020. When access to the article closes, please notify rucforsk@ruc.dk

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