2009 flu pandemic timeline

H1N1 in Turkish Provinces by Late October

Outbreak evolution in Turkey:   Confirmed deaths   Confirmed cases
Disease	Swine flu
Virus strain	H1N1
Arrival date	16 May 2009
Origin	Central Mexico
Deaths	627
Confirmed cases	12,316

This article covers the chronology of the 2009 novel influenza A (H1N1) pandemic. Flag icons denote the first announcements of confirmed cases by the respective nation-states, their first deaths (and other major events such as their first intergenerational cases, cases of zoonosis, and the start of national vaccination campaigns), and relevant sessions and announcements of the World Health Organization (WHO), the European Union (and its agency the European Centre for Disease Prevention and Control), and the U.S. Centers for Disease Control (CDC).

Unless otherwise noted, references to terms like S-OIV, H1N1 and such, all refer to this new A(H1N1) strain and not to sundry other strains of H1N1 which are endemic in humans, birds and pigs.

Take note that the date of the first confirmations of the disease or any event in a country may be before or after the date of the events in local time because of the International Dateline.

Mexico In La Gloria, Veracruz 60% of the town's population is sickened by a respiratory illness of unknown provenance. The government of Mexico believes it to be caused by H3N2 influenza, though at least one patient in La Gloria tested positive for A/H1N1. Two babies died in the outbreak but both were buried without testing.

United States In the ninth week of its routine influenza surveillance, the CDC reports on FluView that thirty-five states have reported widespread influenza activity, and 14 states have reported regional activity, but that although the rate of activity was high, that the proportion of deaths attributed to pneumonia and influenza (P&I) was below the epidemic threshold.