13:43

Both the Welsh first minister and the health minister have said they do not believe there is a particular reason why there have been so many cases in the area covered by the Aneurin Bevan University health board.

On Wednesday the health minister, Vaughan Gething, acknowledged there was a “particular cluster” there but said he did not think it would be an “outlier” as the outbreak continued.

The first minister, Mark Drakeford, said on Tuesday there seemed to be no reason why there had been a cluster of cases in the area. “It’s one of those random things,” he said.

There have been 309 cases in board’s area compared with 628 for the whole of Wales. The board covers areas of south-east Wales including the city of Newport and Monmouthshire.