The Delta variant still infects vaccinated people and their virus levels are similar to unvaccinated people. Also vaccinated people can pass on the Delta variant, which increases the potential for new variants to pop up.
CDC
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Second, new data began to emerge that the Delta variant was more infectious and was leading to increased transmissibility when compared with other variants, even in some vaccinated individuals. This includes recently published data from CDC and our public health partners, unpublished surveillance data that will be publicly available in the coming weeks, information included in CDC’s updated Science Brief on COVID-19 Vaccines and Vaccination, and ongoing outbreak investigations linked to the Delta variant.
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The Delta variant causes more infections and spreads faster than early forms of SARS-CoV-2, the virus that causes COVID-19
The Delta variant is more contagious: The Delta variant is highly contagious, more than 2x as contagious as previous variants.- Some data suggest the Delta variant might cause more severe illness than previous variants in unvaccinated people.
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Everyone who is able, including fully vaccinated people, should wear masks in public indoor places in areas of substantial or high transmission.
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