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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.
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 ...
While the alpha and beta genera are derived from the bat viral gene pool, the gamma and delta genera are derived from the avian and pig viral gene pools. [1] Recombination appears to be common among deltacoronaviruses. [2] Recombination occurs frequently in the viral genome region that encodes the host receptor binding protein.
L452R is found in both the Delta and Kappa variants which first circulated in India, but have since spread around the world. L452R is a relevant mutation in this strain that enhances ACE2 receptor binding ability and can reduce vaccine-stimulated antibodies from attaching to this altered spike protein.
Still, those who have healthy immune systems and have previously been vaccinated or infected are less likely to experience the more severe cases of COVID-19 that result in hospitalization or death.
COVID-19 is expected to circulate indefinitely, but as of 2024, experts were uncertain as to whether it was still a pandemic or had become endemic. [2] [3] Pandemics and their ends are not well-defined, and whether or not one has ended differs according to the definition used. [2] [4]
The (COVID-19) pandemic has put a tremendous strain on many countries' citizens, resources, and economies around the world. [3] This includes the social distancing measures, travel bans, self-quarantines, and business closures are changing the very fabric of societies worldwide. [ 3 ]
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 ...