COVID-19 Real-Time Learning Network

Our editors and expert collaborators provide up-to-date answers to key clinical and scientific questions about COVID-19 vaccination.

During April 11–24, 2021, the Alpha/B.1.1.7 and Gamma/P.1 variants represented an estimated 66% and 5% of U.S. infections, respectively, demonstrating the potential for new variants to emerge and become predominant, according to this CDC MMWR.

After a substantial decrease in administered routine vaccine doses from March-May 2020, administered doses increased from June-September 2020, but not enough to achieve catch-up coverage, according to this CDC MMWR.

CDC will no longer require mask-wearing by people who are outdoors at transportation hubs or on an outdoor area of a conveyance.

Age-stratified results provide evidence of the likely contribution of vaccination coverage to reducing COVID-19 outcomes, according to this CDC MMWR.

This CDC collection of information for U.S. health care providers about becoming a COVID-19 vaccinator includes training resources, FAQs and state/jurisdiction-specific guidance about how to enroll.