An investigation is continuing into an outbreak of E.coli O157 possibly linked to a petting farm in Brecon.
Tests have shown that two children confirmed with E.coli O157 have the same type of infection – meaning that they must have acquired their illness from the same source, a Public Health Wales spokesperson said.
Two other people, who are family members of one of the infected children, have also tested positive for the same type of E.coli O157.
One is believed to have contracted the illness at the same time, but does not have symptoms.
The other became ill at a later date and is believed to have contracted the illness through contact with the child.
Both children had visited Cantref Adventure Farm in the days before they became unwell, and both are recovering at home.
More top news
Wales reached their first ever semi-final of a major tournament with a magnificent 3-1 victory over Belgium in Lille.
There'll be clear spells overnight which means temperatures will fall. Setting us up for a dry start to the weekend, but it won't last!
Watch the men who have been making history by taking Wales to the quarter-finals of the European Championships.