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Respiratory Infections

Belongia EA, Irving SA, Waring SC et al.

Marshfield Clinic Research Foundation, Marshfield, WI, USA.

 JAMA 2010;304:1091–8.

Editor’s note: The 2009 influenza A (H1N1) virus pandemic caused widespread transmission worldwide. Estimates that 43–89 million infections occurred in the US from April 2009 to April 2010 also revealed that children, young adults, pregnant women, and individuals with underlying chronic medical conditions appeared to have the highest risk of hospital admission and critical illness. The authors of this interesting study aimed to compare the clinical features and outcomes of infection with the 2009 H1N1 strain with those of illnesses caused by other influenza strains (seasonal H1N1 and H3N2) in a population-based cohort.

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