There are some perennial questions about coronavirus testing and travel. For example, do you need a coronavirus test before you leave the US? The default answer is yes. Some countries, including Colombia, the Dominican Republic and Mexico, do not require a negative test for admission. But elsewhere, you’ll need to show test results upon arrival, even if you’re only in the country to connect.
https://www.washingtonpost.com/lifestyle/travel/international-travel-coronavirus-testing-requirements-confusion/2021/11/17/85684d9e-46fb-11ec-95dc-5f2a96e00fa3_story.html?utm_source=rss&utm_medium=referral&utm_campaign=wp_lifestyle | Coronavirus testing rule change frustrates tourists