H1N1 (2009) 'swine flu'
06 June 2011 publication
A novel H1N1 virus emerged from Mexico in April 2009 and spread so rapidly that the World Health Organization (WHO) declared a global flu pandemic on 11 June. H1N1 (2009) is now circulating as seasonal flu and has been incorporated into the 2010/2011 seasonal flu vaccine.
