An advert for a coronavirus app promoted by Zara Tindall and husband Mike has been reported over concerns it contradicts government guidance.
The V-Health Passport allows Covid-19 test results to be uploaded to a phone in a bid to get people safely back into stadiums for sporting events.
In an advert to promote it, the Queen’s grandaughter is shown having an antibody test.
But Government guidance says those do not test if people currently have the virus.
The advertisement was referred to the Medicines and Healthcare products Regulatory Agency (MHRA) by Joe Deeks a professor of biostatistics at the University of Birmingham.
He told the BBC: "If people use these tests, they get a negative result and they go and think they haven't got Covid when they could actually still be infectious, that might mean that people don't social distance and so on.
"And that might increase the risk of actually spreading Covid."
VST Enterprises, which owns the app, said the antibody test was used for "illustrative purposes". It agreed that antibody tests are usually only used to identify previous infection.
Zara Phillips and fiance Mike Tindall leave the wedding reception for Prince William in 2011
Getty ImagesIn a statement, VST Enterprises said: "In this particular instance the V-Health Passport was demonstrating how a rapid Covid test kit could be used. It will work with any test that is recommended by government."
A spokesman for the MHRA said it takes "every complaint seriously and we will investigate when necessary to protect public health".
