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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. 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.
A study of samples collected in Manaus between November 2020 and January 2021, indicated that the Gamma variant is 1.4–2.2 times more transmissible and was shown to be capable of evading 25–61% of inherited immunity from previous coronavirus diseases, leading to the possibility of reinfection after recovery from an earlier COVID-19 ...
Deltacoronavirus (Delta-CoV) is one of the four genera (Alpha-, Beta-, Gamma-, and Delta-) of coronaviruses. It is in the subfamily Orthocoronavirinae of the family Coronaviridae . They are enveloped , positive-sense , single-stranded RNA viruses .
The continued spread of the SARS-CoV-2 virus has spawned a Greek alphabet of variants - a naming system used by the World Health Organization to track concerning new mutations of the virus that ...
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 ...
The United States will not lift any existing travel restrictions "at this point" due to concerns over the highly transmissible COVID-19 Delta variant and the rising number of U.S. coronavirus ...
Gammacoronavirus (Gamma-CoV) is one of the four genera (Alpha-, Beta-, Gamma-, and Delta-) of coronaviruses. It is in the subfamily Orthocoronavirinae of the family Coronaviridae . They are enveloped , positive-sense , single-stranded RNA viruses of zoonotic origin .
A PNAS report in September 2020 confirmed that the virus is much more dangerous for the elderly than the young, noting that about 70% of all U.S. COVID-19 deaths had occurred to those over the age of 70. [94] As of early August 2020, among the 45 countries that had over 50,000 cases, the U.S. had the eighth highest number of deaths per-capita.