Patients Hospitalized With 2009 Pandemic Influenza A (H1N1)—New York City, May 2009

The first cases of 2009 pandemic influenza A (H1N1) in New York City occurred in Apr 2009, raising many questions about how best to contain the epidemic. To rapidly assess the severity of influenza illness and identify persons at highest risk for severe infection, the New York City (NYC) Department of Health and Mental Hygiene reviewed the medical charts of the first 99 patients with laboratory confirmed H1N1 admitted to any NYC hospital. The purpose of the review was to characterize the demographics of the first hospitalized patients, identify associated underlying medical conditions, describe the course and severity of disease, and examine the use of antiviral medications. Here, Slopen et al summarize the findings of this analysis. A CDC editorial note is included.