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  1. On 16 April 2020, it was reported that the UK would have first access to the Oxford vaccine, due to a prior contract; should the trial be successful, some 30 million doses would be available. [354] On 2 December 2020, the UK became the first developed country []

  2. The first human case in the United States was on 21 January 2020. The World Health Organization declared the COVID-19 outbreak a Public Health Emergency of International Concern (PHEIC) on 30 January 2020, and first referred to it as a pandemic on 11 March 2020.

  3. January 1–20, 2020. On January 3, CDC Director Robert Redfield was notified by a counterpart in China that a "mysterious respiratory illness was spreading in Wuhan [China]"; he notified HHS Secretary Alex Azar, who shared the report with the National Security Council (NSC).

  4. According to preliminary burden estimates for the 2019–2020 flu season (October 1, 2019 through April 4, 2020) there were between 39 and 56 million flu cases; 18–26 million doctor visits; 410,000 to 740,000 hospitalizations, and between 24,000 and 62,000

  5. This article documents the chronology and epidemiology of SARS-CoV-2 in September 2020, the virus which causes the coronavirus disease 2019 and is responsible for the COVID-19 pandemic. The first human cases of COVID-19 were identified in Wuhan , China, in December 2019.

  6. The number of cases of COVID-19 started to rise in March 2020 and many educational institutions and universities underwent closure. Most countries decided to temporarily close educational institutions in order to reduce the spread of COVID-19.

  7. This article contains the results of the 2020 Democratic Party presidential primaries and caucuses, the processes by which the Democratic Party selected delegates to attend the 2020 Democratic National Convention from August 17–20, 2020.

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