COVID-19: Tracking Variants

Scientists at the Wisconsin State Laboratory of Hygiene and other laboratory partners sequence and track the variants of SARS-CoV-2, the virus that causes COVID-19. Why tracking COVID-19 variants is important:

  • To understand which strains are spreading in our state and make up the largest proportion of new cases.
  • Variants can be more infectious and spread more quickly than the original strain. The Centers for Disease Control and Prevention classifies these as variants of concern.
  • Tracking variants allows us to understand how common the new strains are in our communities, not to have a real-time number of cases that are tied to each strain.

The Delta variant is the predominant strain in Wisconsin

The Delta variant is extremely infectious and is spreading more quickly than any strain of COVID-19 during this pandemic. The best way to protect yourself, your family, and your community from COVID-19 and the Delta variant is to get vaccinated. From January 1, 2021 through July 22, 2021, over 98% of COVID cases occurred among people who were not fully vaccinated.

 


What are variants of SARS-CoV-2? 

Learn how variants of SARS-CoV-2 occur and how they are classified by public health. 

 

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Last Revised: August 2, 2021

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