Amid fears of waning immunity from jabs, Austria has put an expiry date of 270 days on all vaccine certificates for people looking to travel there.
This means anyone from the UK who had their second doses more than nine months before would be barred from going on holiday there, reports The Telegraph.
For example, people who were fully vaccinated in January will see their certificates expire in October, while those who were double-jabbed by the end of April would only have a valid pass until the end of January.
The alternative will be for UK travellers to show evidence of a negative Covid test or a recent recovery from the virus to gain entry.
However, they will also have to self-isolate for between five and 10 days in not fully vaccinated within the window of approximately nine months.
It will come as a blow for fully-vaccinated holidaymakers, with one government source telling the Mail on Sunday that Britons who have received two doses of a Covid vaccine may no longer be considered “fully jabbed” and exempt from quarantine once the booster roll-out has begun.
They told The Mail on Sunday: “The assumption is that you will be required to have the most up-to-date health passport ... so if the advice is to have a booster six months after your second jab, then that is what you’ll need.”