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The timeline of the COVID-19 pandemic lists the articles containing the chronology and epidemiology of SARS-CoV-2, [1] the virus that causes the coronavirus disease 2019 and is responsible for the COVID-19 pandemic. The first human cases of COVID-19 occurred in Wuhan, People's Republic of China, on or about 17 November 2019. [2]
On January 30, 2020, the COVID-19 pandemic is deemed a Public Health Emergency of International Concern by the World Health Organization (WHO). The public and healthcare professionals experience higher levels of anxiety as a result of increased worldwide knowledge. The WHO formally designates COVID-19 a pandemic on March 11, 2020.
COVID-19 was confirmed in South Korea on 20 January 2020. Military bases were quarantined after tests showed three infected soldiers. [308] South Korea introduced what was then considered the world's largest and best-organised screening programme, isolating infected people, and tracing and quarantining contacts. [309]
At the time, the laboratory only obtained a short partial sequence, which was rapidly shared with Vision Medicals, so that Vision Medicals could confirm that the sequence was SARS-CoV-2, i.e., roughly identical to the one they obtained 3 days before, and relatively distant to the original SARS coronavirus.
By late November 2019, coronavirus disease 2019 had broken out in Wuhan, China. [2]As reported in Clinical Infectious Diseases on November 30, 2020, 7,389 blood samples collected between December 13, 2019, and January 17, 2020, by the American Red Cross from normal donors in nine states (California, Connecticut, Iowa, Massachusetts, Michigan, Oregon, Rhode Island, Washington and Wisconsin ...
[b] The COVID-19 pandemic also saw the emergence of misinformation and conspiracy theories, [39] and highlighted weaknesses in the U.S. public health system. [17] [40] [41] In the United States, there have been 103,436,829 [3] confirmed cases of COVID-19 with 1,210,067 [3] confirmed deaths, the most of any country, and the 17th highest per ...
There are only about 20 copies of the E protein molecule in a coronavirus particle. [48] They are 8.4 to 12 kDa in size and are composed of 76 to 109 amino acids. [44] They are integral proteins (i.e. embedded in the lipid layer) and have two domains namely a transmembrane domain and an extramembrane C-terminal domain.
When COVID-19 reached the United States, the original required quarantine was 14 days of length, and later was shortened to 10 days, then 7 days, and eventually even 5 days in some places. Researchers have conducted studies using a variety of methods to analyze the statistical data behind the transmission risks.