Epidemiology of 2009 pandemic influenza a (H1N1) deaths in the United States, April-July 2009

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Abstract

During the spring of 2009, pandemic influenza A (H1N1) virus (pH1N1) was recognized and rapidly spread worldwide. To describe the geographic distribution and patient characteristics of pH1N1-associated deaths in the United States, the Centers for Disease Control and Prevention requested information from health departments on all laboratory-confirmed pH1N1 deaths reported from 17 April through 23 July 2009. Data were collected using medical charts, medical examiner reports, and death certificates. A total of 377 pH1N1-associated deaths were identified, for a mortality rate of. 12 deaths per 100 000 population. Activity was geographically localized, with the highest mortality rates in Hawaii, New York, and Utah. Seventy-six percent of deaths occurred in persons aged 18-65 years, and 9% occurred in persons aged ≥65 years. Underlying medical conditions were reported for 78% of deaths: chronic lung disease among adults (39%) and neurologic disease among children (54%). Overall mortality associated with pH1N1 was low; however, the majority of deaths occurred in persons aged <65 years with underlying medical conditions. © 2011 The Author.

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Fowlkes, A. L., Arguin, P., Biggerstaff, M. S., Gindler, J., Blau, D., Jain, S., … Finelli, L. (2011). Epidemiology of 2009 pandemic influenza a (H1N1) deaths in the United States, April-July 2009. Clinical Infectious Diseases, 52(SUPPL. 1). https://doi.org/10.1093/cid/ciq022

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