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The virus was first confirmed to have spread to Spain on 31 January 2020, when a German tourist tested positive for SARS-CoV-2 on La Gomera in the Canary Islands. [333] Post-hoc genetic analysis has shown that at least 15 strains of the virus had been imported, and community transmission began by mid-February. [ 334 ]
In SARS-CoV-2, the spike protein, which has been imaged at the atomic level using cryogenic electron microscopy, [148] [149] is the protein responsible for allowing the virus to attach to and fuse with the membrane of a host cell; [147] specifically, its S1 subunit catalyzes attachment, the S2 subunit fusion.
This is a general overview and status of places affected by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus which causes coronavirus disease 2019 and is responsible for the COVID-19 pandemic. The first human cases of COVID-19 were identified in Wuhan, the capital of the province of Hubei in China in December 2019. It ...
[1] [2] [3] As of 30 December 2024, 777,074,039 [4] cases have been stated by government agencies from around the world to be confirmed. Of the 248 recognized countries and territories around the world, 229 have reported cases of COVID-19 [5]. For more international statistics in table and map form, see COVID-19 pandemic by country and territory.
Delta (B.617.2) First identified in India in late 2020, the delta variant soon spread across the globe. It became the dominant variant of SARS-CoV-2 until the emergence of omicron in December 2021.
The Wuhan strain has been identified as a new strain of Betacoronavirus from group 2B with approximately 70% genetic similarity to the SARS-CoV. [124] The virus has a 96% similarity to a bat coronavirus, so it is widely suspected to originate from bats as well. [125] [126]
Where did the SARS-CoV-2 virus come from? ... But this theory has not been proven for the virus that causes COVID-19. ... Rollout to poorer countries was slow but the WHO estimates more than 13 ...
By 21 February, a total of 18 people had been confirmed to have SARS-CoV-2 infections [159] and four COVID-19 deaths had occurred. [158] [160] On 24 February, according to the Ministry of Health and Medical Education, twelve COVID-19 deaths had occurred in Iran, out of a total of 64 SARS-CoV-2 confirmed infections. [161] [162]