If the country you are going to travel to has a requirement that the person entering must have a recent test then you must take the test and bring a recent result
That depends on which country you travel to, they are requirements of each country. Inquire on the websites of each embassy
For collmbia they were asking for it, but they took it away. For Cuba I think so.
They do not ask for entry to the USA. For other countries they must enter the consulate and find out
Hello, we traveled to the US, and they didn't ask for it.
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