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From delta to omicron, here's how scientists know which coronavirus variants are circulating in the US

By Alexander Sundermann, Clinical Research Coordinator & DrPH Candidate in Epidemiology, University of Pittsburgh Health Sciences
Lee Harrison, Professor of Epidemiology, Medicine, and Infectious Diseases and Microbiology, University of Pittsburgh Health Sciences

A nationwide genomic surveillance system analyzes positive COVID-19 tests to build a picture of which variants are spreading in the population.

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