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What is Genomic Surveillance?
Viruses are constantly changing, and this includes SARS-CoV-2, the virus that causes COVID-19. These genetic variations occur over time and can lead to the emergence of new variants that may have different characteristics.
The SARS-CoV-2 genome encodes instructions organized into sections, called genes, to build the virus. Scientists use a process called genomic sequencing to decode the genes and learn more about the virus. Genomic sequencing allows scientists to identify SARS-CoV-2 and monitor how it changes over time into new variants, understand how these changes affect the characteristics of the virus, and use this information to better understand how it might impact health.
For example, some variant viruses are of particular concern because they spread more easily, cause more severe disease, or may escape the body’s immune response.
As CDC and public health partners sequence more SARS-CoV-2 genomes, we will improve our understanding of which variants are circulating in the US, how quickly variants emerge, and which variants are the most important to characterize and track in terms of health.
View a map showing the number of confirmed cases in each state.
View a global map showing reports of variants in each country.