The document summarizes information about the 2009 H1N1 swine flu pandemic. It describes the virus as a strain of influenza A that usually infects pigs but developed a new strain that could infect humans. Symptoms are like regular flu but it was particularly dangerous because the new strain was resistant to typical antiviral treatments. The outbreak was classified as either an epidemic or pandemic, with over 17,000 confirmed cases worldwide and 100 confirmed deaths by 2009.