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t. e. Severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2) [2] is a strain of coronavirus that causes COVID-19, the respiratory illness responsible for the COVID-19 pandemic. [3] The virus previously had the provisional name 2019 novel coronavirus (2019-nCoV), [4][5][6][7] and has also been called human coronavirus 2019 (HCoV-19 or ...
In early and mid-January, the virus spread to other Chinese provinces, helped by the Chinese New Year migration. Wuhan was a transport hub and major rail interchange. [205] On 10 January, the virus' genome was shared publicly. [206] A retrospective study published in March found that 6,174 people had reported symptoms by 20 January. [207]
Viruses are by far the most abundant biological entities on Earth and they outnumber all the others put together. [ 89 ] They infect all types of cellular life including animals, plants, bacteria and fungi. [ 6 ]: 49 Different types of viruses can infect only a limited range of hosts and many are species-specific.
The virus can spread to different organs throughout the chicken. [131] The virus is transmitted by aerosol and food contaminated by feces. Different vaccines against IBV exist and have helped to limit the spread of the virus and its variants. [127] Infectious bronchitis virus is one of a number of strains of the species Avian coronavirus. [133]
The University of Oxford's CEBM has pointed to mounting evidence [185] [186] that "a good proportion of 'new' mild cases and people re-testing positives after quarantine or discharge from hospital are not infectious, but are simply clearing harmless virus particles which their immune system has efficiently dealt with" and have called for "an ...
Omicron variant and other major or previous variants of concernof SARS-CoV-2depicted in a tree scaled radially by genetic distance, derived from Nextstrainon 1 December 2021. Part of a serieson the. COVID-19 pandemic. Scientifically accurate atomic model of the external structure of SARS-CoV-2. Each "ball" is an atom.
The Delta variant (B.1.617.2) was [ 3 ][ 4 ] a variant of SARS-CoV-2, the virus that causes COVID-19. It was first detected in India on 5 October 2020. The Delta variant was named on 31 May 2021 and had spread to over 179 countries by 22 November 2021. The World Health Organization (WHO) indicated in June 2021 that the Delta variant was ...
Variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-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).
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