A variant of coronavirus, which was first found in Kent and is known as B117, is believed to be up to 70 per cent transmissible than the previous strain that was dominant in the UK.
In a press conference earlier today health minister, Vaughan Gething, said: "We have to be careful how we come out of lockdown.
"The highly infectious Kent strain is now the most dominant strain in Wales.
"Slightly mutated versions of the Kent strain have also been detected just over our border in Bristol and Liverpool."