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Not much has actually changed. It is not a ban from traveling. Previously in theory, if you traveled from Bonaire to the UK you did not have to self isolate for two weeks on arrival. This has now changed:
Qatar??? Qatar is in the Arabian Gulf in the heart of the Middle East.
I personally know of people who tested negative in Egypt and then tested positive in Dubai on arrival (family of a staff member).
Interesting. With so many different types of test kits in use around the world there are probably many more instances of the example you cite that we are aware of.