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December 12, 2019

A cluster of patients in Wuhan, Hubei Providence, China begin to experience shortness of breath and fever

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January 2, 2020

The World Health Organization activates its incident management system across the three levels of WHO (country office, regional office, and headquarters)

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January 5, 2020

Chinese public health officials share the unknown virus's genetic sequence through an online database.

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January 10, 2020

CDC publishes information about the novel coronavirus on its website.

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January 17, 2020

CDC begins screening passengers on direct and connecting flights from Wuhan, China at San Francisco, California, New York City, New York, and Los Angeles, California and plans to expand screening to other major airports.

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January 30, 2020
The United States reports its first confirmed case of person-to-person transmission of the coronavirus.

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February 6, 2020
First Covid-19 death in the United States: A person in California's Santa Clara County dies of coronavirus (link not confirmed until April 21).

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February 25, 2020
The NIH announces that a clinical trial to evaluate the safety and effectiveness of the antiviral drug remdesivir in adults diagnosed with coronavirus has started at the University of Nebraska Medical Center in Omaha.

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March 11, 2020
WHO declares the novel coronavirus outbreak to be a pandemic. WHO says the outbreak is the first pandemic caused by a coronavirus.

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March 18, 2020
Trump signs into law a coronavirus relief package that includes provisions for free testing for Covid-19 and paid emergency leave.

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April 3, 2020
Trump says his administration is now recommending Americans wear "non-medical cloth" face coverings, a reversal of previous guidance that suggested masks were unnecessary for people who weren't sick.

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April 28, 2020
The US passes one million confirmed cases of the virus, according to Johns Hopkins.

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May 23, 2020
China reports no new symptomatic coronavirus cases, the first time since the beginning of the outbreak in December.

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July 27, 2020
A vaccine being developed by the Vaccine Research Center at the National Institutes of Health's National Institute of Allergy and Infectious Diseases, in partnership with the biotechnology company Moderna, enters Phase 3 testing

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December 10, 2020
Vaccine advisers to the FDA vote to recommend the agency grant emergency use authorization to Pfizer and BioNTech's coronavirus vaccine.

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December 18, 2020
The FDA authorizes a second coronavirus vaccine made by Moderna for emergency use.

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February 22, 2021
The death toll from Covid-19 exceeds 500,000 in the United States.

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March 30, 2021
According to a 120-page report from WHO, the novel coronavirus that causes Covid-19 probably spread to people through an animal, and probably started spreading among humans no more than a month or two before it was noticed in December of 2019.

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April 17, 2021
The global tally of deaths from Covid-19 surpasses 3 million, according to data compiled by Johns Hopkins.

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August 23, 2021
The US FDA grants full approval to the Pfizer/BioNTech Covid-19 vaccine for people age 16 and older, making it the first coronavirus vaccine approved by the FDA.

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October 7, 2021
Pfizer and BioNTech say they are seeking FDA emergency use authorization for their Covid-19 vaccine for children ages 5 to 11.