Visiting These Countries is Risky
The US Centers for Disease Control and Prevention (CDC) updated its COVID-19 Travel Recommendations by Destination on August 30, 2021.
This CDC map highlights the status, Level 1 through Level 4, for each country.
'To maximize protection from the SARS-CoV-2 Delta variant and prevent possibly spreading it to others, get vaccinated as soon as you can and wear a mask indoors in public if you are in an area of substantial or high transmission,' says the CDC.
And when returning to the USA, the CDC says 'all air passengers, including U.S. citizens, are required to have a negative COVID-19 test result or documentation of recovery from COVID-19 (natural immunity) before they board a flight to the United States.
See the CDC's Frequently Asked Questions for more information.