Likewise, CDC shortened the time to five days that close contacts need to quarantine if they get vaccinated and, if they have received a booster dose they do not need to be isolated.

The agency cited growing evidence that the virus is most contagious in the two days before and three days after symptoms develop. People with symptoms after five days are encouraged to remain at home.

Dr. Antony Fauci, physician-scientist and immunologist serving as director of the National Institute of Allergy and Infectious Diseases and the Chief Medical Advisor to the President Joe Biden, said Monday morning that it would be “reasonable” to call for vaccination of those who board domestic flights, a requirement so far requested only from international passengers, but they have not yet taken a decision about it.

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