Disease Burden of the H1N1 Pandemic Flu Virus, 2009-2018

Since the introduction of the influenza A H1N1pdm09 virus in 2009, the virus has circulated seasonally in the U.S. causing illnesses, hospitalizations and deaths. CDC estimates that from 2009 through 2018, influenza A H1N1pdm09 has caused at least 100.5 million illnesses, 936,000 hospitalizations and 75,000 deaths.

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