SARS-CoV-2 lineages with similar characteristics may affect how fast the virus spreads, the severity of illness it causes, or the effectiveness of treatments against it some of these may be classified by the World Health Organization (WHO) or the U.S. All lineages have names to help scientists talk about them. The SARS-CoV-2 virus can be mapped out similar to a family tree. As genetic changes happen over time, the virus that causes COVID-19 begins to form genetic lineages. What You Need to Know About Variants | View Transcript Īs a virus spreads, it has a chance to change. Those variants must be monitored more carefully. Some variations allow the virus to spread more easily or make it resistant to treatments or vaccines. These small differences, or variants, have been studied and identified since the beginning of the pandemic. By comparing the branches, scientists can label them according to the differences. If you think about a virus like a tree growing and branching out, each branch on the tree is slightly different than the others.
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