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On this day, December 31, 2019, the World Health Organization was informed of cases of pneumonia with an unknown cause. [View all]
https://en.wikipedia.org/wiki/December_31• 2019 – The World Health Organization is informed of cases of pneumonia with an unknown cause, detected in Wuhan. This later turned out to be COVID-19, the cause of the COVID-19 pandemic.
One year later, to the day:
• 2020 – The World Health Organization issues its first emergency use validation for a COVID-19 vaccine.
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