People walk on Fishermans Wharf in San Francisco, California, on June 15, 2021. David Paul Morris/Bloomberg/Getty ImagesThe US Centers for Disease Control and Prevention is now calling the Delta variant of the novel coronavirus, also known as B.1.617.2, a “variant of concern.”
The variant of concern designation is given to strains of the virus that scientists believe are more transmissible or can cause more severe disease. Vaccines, treatments and tests that detect the virus may also be less effective against a variant of concern. Previously, the CDC had considere
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What we know about the Delta coronavirus variant
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