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Variants of severe acute respiratory syndrome coronavirus 2 are viruses that, while similar to the original, have genetic changes that are of enough significance to lead virologists to label them separately. SARS-CoV-2 is the virus that causes coronavirus disease 2019 (COVID-19).
This article documents the chronology and epidemiology of SARS-CoV-2 in 2019, the virus that causes coronavirus disease 2019 and is responsible for the COVID-19 pandemic. The first human cases of COVID-19 known to have been identified were in Wuhan , Hubei , China , in December 2019.
B.1.617.2 has the T478K mutation, not found in B.1.617.1 and B.1.617.3. [ 34 ] [ 35 ] Simultaneously, the ECDC released a brief maintaining all three sublineages of B.1.617 as VOI, estimating that a "greater understanding of the risks related to these B.1.617 lineages is needed before any modification of current measures can be considered".
SARS-CoV-2 is the seventh known coronavirus to infect people, after 229E, NL63, OC43, HKU1, MERS-CoV, and the original SARS-CoV. [105] Like the SARS-related coronavirus implicated in the 2003 SARS outbreak, SARS‑CoV‑2 is a member of the subgenus Sarbecovirus (beta-CoV lineage B). [106] [107] Coronaviruses undergo frequent recombination. [108]
The first human cases of COVID-19 occurred in Wuhan, People's Republic of China, on or about 17 November 2019. [2] The first confirmed human case in the United States was on 19 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 ...
A COVID-19 vaccine is intended to provide acquired immunity against severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2), the virus that causes coronavirus disease 2019 . Prior to the COVID-19 pandemic, an established body of knowledge existed about the structure and function of coronaviruses causing diseases like severe acute ...
In December 2019, a pneumonia outbreak was reported in Wuhan, China. [119] On 31 December 2019, the outbreak was traced to a novel strain of coronavirus, [120] which was given the interim name 2019-nCoV by the World Health Organization, [121] [122] [123] later renamed SARS-CoV-2 by the International Committee on Taxonomy of Viruses.
WHO announces that "Of 899,935 Covid-19 test samples sequenced and uploaded to the global Covid database in the last 60 days, 897,886 (99.8%) were confirmed to be Delta, while 713 (0.1%) were Omicron." Cases in South Africa rise by 110% in one week. [90] Cuba reports its first case, in a person who had traveled from Mozambique. [91]