Related Experiment Video
Updated: Aug 6, 2025
06:08
Author Spotlight: A Pseudotype Virus System for Assessing Omicron Subvariants and Neutralizing Antibodies in SARS-CoV-2 Research
Published on: September 8, 2023
1.3K
Covid-19: virology, variants, and vaccines
Megan Young1, Harry Crook1, Janet Scott2
1Faculty of Medicine, Imperial College London, London, UK.
BMJ Medicine
|March 20, 2023
Summary
The SARS-CoV-2 virus continues to evolve, leading to new variants with increased transmissibility. Current vaccines offer protection against severe disease, with ongoing research into viral genetics and vaccine effectiveness.
Area of Science:
- Virology
- Immunology
- Genetics
Background:
- The COVID-19 pandemic, caused by SARS-CoV-2, has led to over 349 million diagnoses and 5.59 million deaths globally.
- Continuous viral evolution necessitates understanding SARS-CoV-2 genetics, structure, and emerging mutations.
- The World Health Organization has identified multiple SARS-CoV-2 variants of concern and interest due to mutations affecting transmissibility and immune escape.
Purpose of the Study:
- To review the genetics, structure, and transmission of SARS-CoV-2 and its variants.
- To highlight how mutations enhance viral spread and disease severity.
- To outline currently approved vaccines, their immunogenicity, and effectiveness.
Main Methods:
- Review of scientific literature on SARS-CoV-2 molecular evolution, virology, and vaccinology.
- Analysis of data on reported COVID-19 cases, deaths, and vaccine approvals.
- Synthesis of information on viral mutations, variant characteristics, and vaccine performance.
Main Results:
- SARS-CoV-2 variants possess mutations conferring increased transmissibility, disease severity, and antibody escape.
- As of January 2022, numerous vaccines have been approved globally, with booster doses enhancing protection.
- Vaccine strategies demonstrate effectiveness against severe COVID-19 disease.
Conclusions:
- Understanding SARS-CoV-2 evolution is crucial for public health strategies.
- Vaccines remain a key tool in mitigating the impact of COVID-19.
- Ongoing monitoring and research are essential to address evolving viral threats.
More Related Videos
Related Concept Videos
00:36Viral Mutations
32.7K
A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
32.7K
01:29Viruses with RNA Genomes
66
RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
66
00:57Viral Recombination
23.6K
Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
23.6K
01:26Size and Structure of Viral Genomes
81
Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
81
00:50What are Viruses?
115.7K
Overview
115.7K
02:50Conjugated Proteins
18.4K
Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
18.4K