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That's a reasonable thought. but do you think the tourist industries would be able to survive whilst awaiting a vaccine, which may and a big maybe available by the end of the year.
Great swathes of what the tourists might be coming for would no longer exist perhaps?. I think the idea of a Vaccine certificate in Passports would be an idea Governments may well consider, but where would one stop - a vaccine cert for all kinds of viral diseases or existing health problems detailed and documented before entry into another country - who knows?