Brits will have to get re-vaccinated if the want to visit Austria more than nine months after having their second jab
Vienna has imposed a 270 day expiry date on all Covid vaccines amid concerns they aren't as effective as time goes by.
According to The Telegraph, the clock on vaccines begins the minute it is administered.
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Travellers from the UK can also show a recent negative Covid test to gain entry.
It is still unclear how long the vaccines remain effective for due to how new they are.
The most recent Pfizer-BioNTech data shows 91% overall efficacy falling to 84% at the six-month mark, and a steady 97% against severe disease, Yale Medicine reports.
Moderna’s vaccine was 93% effective overall through six months and 98% effective against severe disease, according to a company statement in August.
Yale Medicine infectious diseases specialist, Dr Jaimie Meyer, said: "We can only say that a vaccine is protective as long as we are measuring it."
A recent study published in Nature found that mRNA vaccines, such as Moderna and Pfizer, set off an immune response that could last years against the original virus strain.
Austria's decision comes as the UK government plans to place restrictions on people who have not had a booster shot, it has been reported.
At the moment, double-jabbed Brits can go to amber list countries without having to quarantine upon their return.
Millions are set to be offered a third jab from September after Health Secretary, Sajid Javid, announced the roll-out to priority groups.
This could become necessary for those wanting to travel abroad without isolating.
A source 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."
