H1N1 Swine Flu 2009

About H1N1 Swine Flu 2009

The H1N1 influenza pandemic of 2009 originated in Mexico and was caused by a triple reassortant swine influenza virus. The WHO declared a pandemic on June 11, 2009. The virus spread rapidly, reaching 214 countries. Estimated global deaths in the first year ranged from about 150,000 to 575,000, with laboratory confirmed deaths at approximately 18,500. Unlike typical flu, the pandemic disproportionately affected children and young adults, with 80 percent of deaths in people under 65. A vaccine was developed and available by October 2009. The WHO faced criticism for declaring a pandemic, with some European politicians alleging pharmaceutical industry influence. A 2011 review committee found no evidence of commercial influence on WHO decisions, while criticising aspects of its transparency and communication. The pandemic highlighted the importance of influenza surveillance and the speed of vaccine production. The virus continues to circulate as a seasonal H1N1 strain. The 2009 experience informed pandemic influenza preparedness planning that proved valuable during COVID 19.