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Viral Recombination00:57

Viral Recombination

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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.
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When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
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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...
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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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In the ever-evolving field of public health, statistical analysis serves as a cornerstone for understanding and managing disease outbreaks. By leveraging various statistical tools, health professionals can predict potential outbreaks, analyze ongoing situations, and devise effective responses to mitigate impact. For that to happen, there are a few possible stages of the analysis:
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Updated: Dec 24, 2025

Author Spotlight: Advancements in Multiplex Detection of Respiratory Viruses
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Wuhan virus spreads.

Jessica Hamzelou

    New Scientist (1971)
    |April 15, 2020
    PubMed
    Summary

    The novel coronavirus causing severe illness and fatalities in China is now confirmed to be human-transmissible. This viral transmission between people raises significant public health concerns globally.

    Area of Science:

    • Virology
    • Epidemiology
    • Public Health

    Background:

    • A novel virus has emerged in China, causing significant mortality and morbidity.
    • Initial transmission routes were unclear, prompting urgent investigation.

    Purpose of the Study:

    • To determine if the virus responsible for recent outbreaks in China can be transmitted between humans.
    • To understand the transmission dynamics of this emerging infectious agent.

    Main Methods:

    • Epidemiological investigation of confirmed cases.
    • Contact tracing and analysis of transmission chains.
    • Viral sequencing and phylogenetic analysis.

    Main Results:

    • The virus has been confirmed to spread from person to person.

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  • Evidence of human-to-human transmission indicates efficient spread within communities.
  • Genomic data supports recent common origin and ongoing transmission.

    • Conclusions:

    • The virus causing deaths and infections in China is capable of human transmission.
    • This finding necessitates immediate public health interventions to control the outbreak.
    • Further research is crucial to understand transmission rates and severity.