Table 2.

Timecourse of swine-origin influenza virus A/H1N1 pandemic (adapted from [1])

Date	Outbreak and spread
February 2009	Outbreak of respiratory illness in La Gloria, Veracruz, Mexico
April 12th	Mexican public health authorities report outbreak in Veracruz to the Pan American Health Organization
April 15th	US Centers for Disease Control (CDC) identifies swine influenza in a specimen of a boy from San Diego, California
April 17th	CDC identifies swine influenza in a specimen of a girl from Imperial, California
April 21st	CDC alerts physicians to a new strain of H1N1 influenza virus
April 23rd	Public Health Agency of Canada identifies swine influenza in specimens from Mexico
April 24th	WHO issues Disease Outbreak Notice
April 27th	International spread and human-to-human transmission prompt WHO to raise pandemic alert from phase 3 to phase 4
April 29th	Due to human-to-human transmission in two different countries, WHO raises the pandemic alert to phase 5
July 4th	Appearance of oseltamivir-resistant viruses
July 11th	WHO endorses recommendations for vaccination
June 11th	Due to human-to-human transmission in two different WHO regions, WHO raises the pandemic alert to phase 6
September 16th	Continued global spread, more than 160 countries affected, 280 000 reported cases, including 3 200 deaths

Entry closed: September 16th, 2009