Four people have tested positive for for bird flu after an outbreak of the virus on a north Wales farm, the Health Protection Agency confirmed.
Dr Christianne Glossop, Chief Veterinary Officer for Wales, previously said it was not the most dangerous H5N1 strain but H7N2 low pathogenic avian influenza.
The Health Protection Agency (HPA) carried out tests on specimens from nine people associated with the incident - seven from Wales and two from north west England.
Of the four positive results, two were from Wales and two were from north west England.
The remaining five were negative, the HPA said.
On Thursday, 30 chickens were slaughtered at the smallholding in Corwen after 15 birds died.
The dead birds were 22-week-old Rhode Island Red chickens which were bought by the smallholding two weeks ago.
One of the new chickens died the day after it was taken to the farm and all later died.
Tests were carried out after the farm's owners contacted their own vet. A 1km restriction zone was been set up around the farm, stopping birds and bird products being moved in or out of the area.
