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Novel H1N1 influenza hospitalizations: Minneapolis-St. Paul metropolitan area, 2008-2009

Laura Fleege1, Emily Hallberg, Craig Morin

  • 1School of Public Health, University of Minnesota, USA.

Minnesota Medicine
|January 15, 2010
PubMed

Insights

The 2008-2009 influenza season saw a novel influenza A (nH1N1) outbreak, particularly affecting children in Minnesota. Hospitalized nH1N1 patients had higher rates of asthma and pneumonia compared to seasonal flu cases.

Area of Science:

  • Epidemiology
  • Infectious Diseases
  • Public Health

Background:

  • The 2008-2009 influenza season was marked by the emergence of a novel influenza A (nH1N1) strain.
  • This new strain spread rapidly across the United States, including Minnesota.

Purpose of the Study:

  • To characterize the epidemiological features of the novel influenza A (nH1N1) strain in Minnesota.
  • To compare nH1N1 cases with seasonal influenza A cases regarding patient demographics and clinical outcomes.

Main Methods:

  • Retrospective analysis of influenza cases in Minnesota during the 2008-2009 season.
  • Comparison of incidence rates, comorbidities (asthma), and complications (pneumonia) between nH1N1 and seasonal influenza A.

Main Results:

  • A higher incidence rate of novel influenza A (nH1N1) was observed among children in Minnesota.
  • Hospitalized nH1N1 patients showed a greater proportion with a history of asthma.
  • The incidence of pneumonia at discharge was higher in hospitalized nH1N1 cases compared to seasonal influenza A.

Conclusions:

  • Novel influenza A (nH1N1) presented distinct epidemiological and clinical characteristics in Minnesota during the 2008-2009 season.
  • Children and individuals with asthma were disproportionately affected by nH1N1.
  • nH1N1 infection was associated with an increased risk of pneumonia among hospitalized patients.

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