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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Related Experiment Video

Updated: Sep 30, 2025

Live Imaging and Quantification of Viral Infection in K18 hACE2 Transgenic Mice Using Reporter-Expressing Recombinant SARS-CoV-2
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SARS-CoV-2 variants and vaccination.

Yang Liu1, Jianying Liu1, Pei-Yong Shi2,3,4,5,6

  • 1Institute of Infectious Disease, Shenzhen Bay Laboratory, Shenzhen, Guangdong, China.

Zoonoses (Burlington, Mass.)
|March 14, 2022
PubMed
Summary
This summary is machine-generated.

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants continually emerge, impacting transmission and vaccine effectiveness. This review discusses key variants and their effects on viral replication and immune evasion.

Keywords:
COVID-19SARS-CoV-2 variantsneutralizationspike mutationsvaccine

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Area of Science:

  • Virology
  • Immunology
  • Epidemiology

Background:

  • Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has caused a global pandemic since late 2019.
  • Viral evolution has led to the emergence of numerous variants with altered characteristics.

Purpose of the Study:

  • To review key SARS-CoV-2 variants.
  • To discuss the implications of these variants on viral replication, transmission, and immune evasion.

Main Methods:

  • Literature review of scientific publications.
  • Analysis of variant characteristics and their impact.

Main Results:

  • SARS-CoV-2 variants exhibit changes in transmissibility and immune evasion.
  • Emerging variants pose ongoing challenges to vaccine efficacy.

Conclusions:

  • Understanding SARS-CoV-2 variant evolution is critical for public health.
  • Continuous monitoring and research are necessary to address variant threats.