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FIRST INFECTION
First case of infection in humans by the influenza A H1N1 virus detected in California. -
CANDIDATE VACCINE
CDC began work to develop a vaccine candidate virus. -
PUBLIC EMERGENCY
The World Health Organization declared a public health emergency of international concern. -
IT STARTED TO BEEN WORSE
2009 H1N1 influenza summer activity peaked in the United States during May and June -
STUDENTS
Peak school dismissal day in the spring phase of the pandemic. 980 schools were dismissed, affecting 607,778 students. -
PREGNANT WOMEN
CDC reported early data on 2009 H1N1 illness among pregnant women in an MMWR. -
WORLDWIDE PANDEMIC
The World Health Organization (WHO) declared a pandemic and raised the worldwide pandemic alert level to phase 6, which means the virus was spreading to other parts of the world.
CDC held its first press conference with former CDC Director Thomas Frieden, MD, MPH. The press conference had 2,355 participants -
NEW STATES DISCOVERED ILLNESS
All 50 states, the District of Colombia, Puerto Rico and the U.S. Virgin Islands had reported cases of 2009 H1N1 infection.
By late-June, more than 30 summer camps in the U.S. had reported outbreaks of 2009 H1N1 influenza illness. CDC released guidance for day and residential camps to reduce spread of influenza. -
CLINICAL TRIALS OF THE VACCINE
Clinical trials testing the 2009 H1N1 flu vaccine began. -
USA ESTIMATED MORE CASES
CDC estimated at least 1 million cases of 2009 H1N1 influenza had occurred in the United States. -
SCHOOL SUSPENSION
CDC's School Suspension Monitoring System (SDMS) was activated. -
KITS SEND TO MANY COUNTRIES
More than 1,000 test kits shipped to 120 domestic and 250 international laboratories in 140 countries since May 1, 2009. -
APPROVATION OF VACCINES
The FDA announced its approval of four 2009 H1N1 influenza vaccines.
Timelineicon
September 30
U.S. states placed first orders of 2009 H1N1 vaccine. -
FIRST ORDER OF VACCINES TO THE US
U.S. states placed first orders of 2009 H1N1 vaccine. -
VACCINE OPEN TO EVERYBODY
Vaccination against 2009 H1N1 influenza had been opened to anyone who wanted to be vaccinated. -
NATIONAL INFLUENZA VACCINATION WEEK
The President of the United States declared National Influenza Vaccination Week (NIVW) and encouraged all Americans to celebrate the week by getting vaccinated against 2009 H1N1 influenza. -
INFLUENZA H1N1
FDA’s VRBPAC selected 2009 H1N1 virus for inclusion in 2010-2011 seasonal flu vaccine -
RECOMMENDATIONS
WHO published recommendations for the composition of influenza virus vaccines for the upcoming Northern Hemisphere influenza season. Components included a 2009 H1N1-like virus. -
END
Announced the end of the 2009 H1N1 influenza pandemic
