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Patient 0
The first recorded case. In California -
Period: to
Pandemia
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Second Case
Second case detected in California almost 130 miles away from the first case of infection, without a connection to the previous patient. -
Health Emergency
The World Health Organization (WHO) declared a state of public health emergency of international interest. -
Increase
The United States declares a public health emergency as cases of swine flu increase. -
Level 4
World Health Organization (WHO) raises the influenza pandemic alert to a level 4, which means that there has been human-to-human transmission of the virus. -
Level 5
WHO raises the influenza pandemic alert to a level 5, indicating sustained community-level outbreaks in two or more countries within the same region. -
Influenza Pandemic
The WHO intensified the alert level for an influenza pandemic from phase 4 to phase 5 to indicate that a pandemic was imminent. -
School Suspension
The day that school suspension was highest in the spring stage of the pandemic. 980 schools suspended classes and 607 778 students were affected. -
Level 6
WHO raises the influenza pandemic alert to a level 6. The outbreak is now being considered a global pandemic. -
Clinical trials
Clinical trials began to evaluate the 2009 H1N1 influenza vaccine. -
Vaccines approval
The FDA announced the approval of four 2009 H1N1 influenza vaccines. -
Highest level
Influenza activity reached its highest level in the weekly report of October 24, 2009, where 48 of 50 states reported widespread influenza activity. -
Phase 6
The World Health Organization (WHO) declared the pandemic and raised the global pandemic alert level to Phase 6, indicating that the virus was spreading in other parts of the world. -
Post pandemic period
WHO Director General Dr. Margaret Chan announces that the H1N1 outbreak has moved into the post-pandemic period. -
End of Pandemia
The WHO announced the end of the 2009 H1N1 influenza pandemic. -
Global death
A study published in the Lancet Infectious Diseases journal estimates that the global death toll from the pandemic ranges between 151,700 and 575,400.