U.S. CDC Issues Numerous Level 4 Travel Alerts
As the COVID-19 pandemic situation worldwide evolves, the U.S. CDC is continuing to monitor coronavirus risk in destinations around the world and offer travel recommendations.
As of February 2, 2021, the CDC reissued Level 4, COVID-19 Very High, Travel Alerts for various countries.
For example, the CDC says, 'travelers should avoid all travel to Canada. If you must visit Canada before traveling, get tested with a viral test 1–3 days before your trip.
Furthermore, all air passengers coming to the USA, including U.S. citizens, are required to have a negative COVID-19 test result or documentation of recovery from COVID-19 before they board a flight to the United States. See the FAQs for more information.