People are being warned not to post photographs of their lateral flow test results on social media.
The warning comes as codes on coronavirus tests are being copied by criminal gangs and fake results are being sold, according to one of the UK's leading security training platforms.
Anyone using or supplying a fake covid pass could face a £10,000 fine but they are still being advertised online, Wales Online reports.
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Shahzad Ali, CEO at Get Licensed, has warned fake covid passes will compromise the safety of venues like nightclubs and advised people to not share their lateral flow test results online.
Shahzad said: “We have seen fake documentation for many years, for example, fake IDs have been a regular feature at nightclubs for a number of years.
"This is just a new complication that door supervisors will soon become used to facing. It was always inevitable that fake Covid passes would start to appear as soon as there were rumours of them being introduced.
"Whilst grossly unethical and potentially very dangerous, it is also illegal to use/supply/distribute fake Covid passes and could see you rack up a fine of £10,000 should you be caught."
Shahzad added: “There is obviously going to be a market for Covid passes, because there will be people who want to go about their life like normal and not have to take Covid tests for things they didn’t have to before, so it is extremely important that you look after your Covid pass.
"Our advice would be to avoid posting it on social media, don’t share the code from the lateral flow you have taken because others could register it as their test.
“Covid passes will potentially make door supervisors' jobs much more difficult, especially when we consider the consequences of people who are especially forthcoming with their beliefs, it could make the job much more dangerous.”
Earlier this month Sky News reported that fake or fraudulent EU Covid certificates were being advertised online by criminal groups.
It was said the criminals are trying to capitalise on anti-vaccination views across Europe, and are using the rising cases and the Omicron variant of coronavirus to increase sales.
A few weeks ago Sky News discovered evidence of these passes, which have the potential to be used as proof of vaccination to gain access into the UK, being promoted on social media in at least nine European countries.
This week EuroNews also reported that Italian authorities suspended 17 public and private messaging platforms, which were advertising the supply of illegal Covid-19 vaccination certificates.
In the UK a covid passport is now required to enter nightclubs, indoor unseated venues with more than 500 people, unseated outdoor venues with more than 4,000 people and any venue with more than 10,000 people.
