2009 H1N1 Swine Flu Pandemic: Global Impact
The 2009 H1N1 influenza pandemic ("swine flu") caused an estimated 1.4 billion infections and over 575,000 deaths worldwide (CDC/WHO modeling estimates).
Unlike seasonal flu, the 2009 pandemic disproportionately affected younger people (born after 1957 lacked cross-protective immunity), pregnant women, and those with obesity or chronic conditions. The virus continues to circulate as a seasonal H1N1 strain.
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