• Vol. 42 No. 7, 354–355
  • 15 July 2013

The Quest for a H1N1 Vaccine

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On 24 April 2009, the World Health Organisation (WHO) put out an alert on an influenza-like illness in the United States (US) and Mexico. The United States Government reported 7 confirmed human cases of Swine Influenza A/ H1N1 in the US. Six days later, following daily updates, the WHO pandemic alert was raised from Phase 4 to Phase 5. Phase 5 is characterised by human-to-human spread of the virus in at least 2 countries in one of the WHO regions. Just 3 days later, on 3 May 2009, 17 countries had officially reported 787 cases of confirmed infection.

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