Influenza A (H1N1) Pandemic - Apr 2009
Since its emergence in April 2009, pandemic influenza A(H1N1) 2009 virus affected all parts of the world, causing the first influenza pandemic since 1968. Following the observation that 1 or 2 epidemic periods had occurred in most countries and in most WHO Regions, WHO declared on 10 Aug 2010 that the world was moving into the post-pandemic period. (WHO, 18 Feb 2011)