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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-04-27 and was most recently seen on 2026-04-27.
The 2009 flu pandemic in the United States was caused by a novel strain of the Influenza A/H1N1 virus, commonly referred to as "swine flu", that was first detected on April 15, 2009. While the 2009 H1N1 virus strain was commonly referred to as "swine flu", there is no evidence that it is endemic to pigs or of transmission from pigs to people; instead, the virus spreads from person to person.
On April 25, the World Health Organization declared a public health emergency, followed concurringly by the Obama administration on April 26.
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