2009 Nov 12 – NEJM Correspondence: Older Age and a Reduced Likelihood of 2009 H1N1 Virus Infection

Rachel Savage, M.Sc., et al; Ontario Agency for Health Protection and Promotion, Toronto, ON, Canada. NEJM. Volume 361:2000-2001 November 12, 2009 Number 20
To the Editor: Early epidemiologic reports regarding the 2009 pandemic influenza A (H1N1) virus suggest that cases of infection and deaths are concentrated in adults between the ages of 20 and 40 years.1 This finding could reflect age-related differences in susceptibility or differential testing and diagnosis in this age group.


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