Why some mutations matter while most are just background noise
In short: Viruses like SARS-CoV-2 are constantly changing, but not every mutation creates a crisis. While the vast majority of genetic shifts have little to no impact on how the virus behaves, specific changes can fundamentally alter its ability to spread, its severity, or even how well our current medicines work.
The evolution of SARS-CoV-2 is a continuous process. However, most mutations are functionally neutral, meaning they do not significantly change the virus's properties. The World Health Organization (WHO) established a specific focus on variants in June 2020 to identify those that actually pose risks. These 'variants of interest' (VOIs) and 'variants of concern' (VOCs) are prioritized because they may affect transmission rates, disease severity, or the efficacy of vaccines and diagnostic tools.
To manage this complexity, global health bodies use a tiered classification system. The WHO began using simple labels in May 2021 to help communicate risk clearly to the public. In March 2023, these definitions were updated to include 'variants under monitoring' (VUM). For example, the BA.3.2 variant—sometimes called 'Cicada'—re-emerged in South Africa in late 2024 and was designated a VUM by the WHO. As of September 2026, health agencies like the ECDC continue to monitor these lineages using multidisciplinary teams that include experts in bioinformatics and mathematical modeling.
Monitoring is no longer just about human cases. Modern strategies now emphasize tracking the virus in animal populations and among chronically infected individuals to preempt mutations with negative public health implications. In 2024, the WHO launched the Coronavirus Network (CoViNet) to facilitate early detection and coordinated risk evaluations. While new variants like XFG and NB.1.8.1 circulate today, current data suggests they do not lead to more severe illness than previous versions, highlighting the importance of ongoing genomic surveillance over reactionary fear.
Opens the Intellect+ feed with this card first. Swipe up for the next one.
Sources
- Summary by Intellect · source: What to Know About the New COVID Variants | SciShow News
- Also: Tracking SARS-CoV-2 variants
- Also: Should we be worried about the current COVID-19 variants? – UK Health Security Agency
To cite this card, link to https://intellectplus.co.uk/app/science-what-to-know-about-the-new-covid-variants-scishow-news.
How we source, check and correct cards: Editorial standards.
General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.
Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?
Related
More in Evolutionary biology · More in Science · Latest · A–Z · All topics
