(CNBC) – The Centers for Disease Control and Prevention is expected to recommend Tuesday that fully vaccinated people begin wearing masks indoors again in places with high Covid-19 transmission rates, according to a new report from CNBC and people familiar with the matter.

Federal health officials still believe fully vaccinated individuals represent a very small amount of transmission, according to the sources. Still, some vaccinated people could be carrying higher levels of the virus than previously understood and potentially transmit the virus to others, they said.

The updated guidance comes ahead of the fall season when the highly contagious delta variant is expected to cause another surge in new coronavirus cases and many large employers plan to bring workers back to the office.

Health experts fear delta, already the dominant form of the disease in the U.S. is hitting states with low vaccination rates and high prevalence of the virus.


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