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To reduce introduction and spread of new variants of SARS-CoV-2, CDC issued an Order effective January 26, 2021. It requires all air passengers arriving to the US from a foreign country to get tested for COVID-19 infection no more than 3 days before their flight departs and to provide proof of the negative result or documentation of having recovered from COVID-19 to the airline before boarding the flight.
President Biden also wants a mandatory quarantine for foreign visitors and has asked the CDC for recommendations on how long it should be.