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SARS-CoV-2 is the virus that causes coronavirus disease 2019 (COVID-19). Some have been stated, to be of particular importance due to their potential for increased transmissibility, [ 1 ] increased virulence, or reduced effectiveness of vaccines against them.
In November 2021, the transmissibility of the Omicron variant, as compared to the Delta variant or other variants of the COVID-19 virus, was still uncertain. [304] Omicron is frequently able to infect previously COVID-19-positive people. [314] [315]
SARS-related coronavirus is a member of the genus Betacoronavirus (group 2) and monotypic of the subgenus Sarbecovirus (subgroup B). [13] Sarbecoviruses, unlike embecoviruses or alphacoronaviruses, have only one papain-like proteinase (PLpro) instead of two in the open reading frame ORF1ab. [14]
A nationwide survey of randomly selected positive COVID-19 samples first analysed by a RT-PCR screening test and subsequently confirmed by genome sequencing, revealed that the variant grew from a share of 3.3% (388/11916) on 7–8 January (week 1) [123] to 13.3% (475/3561) on 27 January (week 4), [85] followed by 44.3% (273/615) on 16 February ...
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 ...
During the initial outbreak in Wuhan, China, various names were used for the virus; some names used by different sources included "the coronavirus" or "Wuhan coronavirus". [ 27 ] [ 28 ] In January 2020, the World Health Organization (WHO) recommended "2019 novel coronavirus" (2019-nCoV) [ 5 ] [ 29 ] as the provisional name for the virus.
BA.2.86 was first reported by Denmark and Israel. [1] [11] On 18 August 2023, when only six cases had been reported from four countries (Denmark, Israel, the United Kingdom and the United States), the British healthcare authorities noted that its almost simultaneous appearance in several countries still operating detailed genomic surveillance indicated that it likely already was spreading more ...
Theta variant, also known as lineage P.3, [a] is one of the variants of SARS-CoV-2, the virus that causes COVID-19. The variant was first identified in the Philippines on February 18, 2021, when two mutations of concern were detected in Central Visayas . [ 1 ]
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