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Related Concept Videos

Prevalence and Incidence01:08

Prevalence and Incidence

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In statistical epidemiology and health sciences, two essential metrics—prevalence and incidence—are fundamental for understanding disease dynamics within a population. These measures enable public health officials, epidemiologists, and researchers to assess the burden of diseases, allocate resources effectively, and design impactful public health policies and interventions.
Prevalence indicates the proportion of individuals in a population who have a specific disease or health...
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Single Nucleotide Polymorphisms-SNPs01:05

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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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Viruses with RNA Genomes01:29

Viruses with RNA Genomes

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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...
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Transmission-based Precautions I: Contact, Enteric, and Droplets01:17

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Transmission-based precautions are for patients known to be infected or suspected to be infected or colonized with organisms that pose a significant risk to others. Some transmission-based precautions include contact, enteric, and droplet.
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Testing a Claim about Population Proportion01:24

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A complete procedure for testing a claim about a population proportion is provided here.
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Related Experiment Video

Updated: Sep 4, 2025

Author Spotlight: A Pseudotype Virus System for Assessing Omicron Subvariants and Neutralizing Antibodies in SARS-CoV-2 Research
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Omicron still on the rise.

Clare Wilson

    New Scientist (1971)
    |July 20, 2022
    PubMed
    Summary

    The Omicron BA.4 and BA.5 subvariants are causing a rise in coronavirus disease 2019 (COVID-19) cases globally. Public health officials are monitoring these rapidly spreading strains.

    Area of Science:

    • Virology
    • Epidemiology
    • Public Health

    Background:

    • The COVID-19 pandemic continues, with ongoing evolution of the SARS-CoV-2 virus.
    • New subvariants of concern emerge, necessitating continuous surveillance and analysis.

    Purpose of the Study:

    • To report on the increasing global prevalence of Omicron BA.4 and BA.5 subvariants.
    • To highlight the epidemiological impact of these specific SARS-CoV-2 strains.

    Main Methods:

    • Analysis of global COVID-19 case data.
    • Monitoring of SARS-CoV-2 subvariant circulation.

    Main Results:

    • The BA.4 and BA.5 subvariants of Omicron are identified as the primary drivers of increased COVID-19 cases.

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  • These subvariants are contributing to a surge in infections across multiple countries.

    • Conclusions:

    • The emergence and spread of BA.4 and BA.5 underscore the dynamic nature of the COVID-19 pandemic.
    • Continued vigilance and data reporting are crucial for understanding and managing viral evolution and transmission.