More than 3,300 patients have been tested for Hepatitis C after it was revealed a former healthcare had been diagnosed with the virus.
Out of the patients tested, four had contracted the virus from the worker.
Aneurin Bevan Health Board started contacting patients back in September this year when the former worker in obstetrics and gynaecology discovered they had Hepatitis C.
The healthcare worker was based mainly at Caerphilly District Miners’ hospital but also worked for a short time at the old East Glamorgan Hospital in Church Village near Pontypridd and Wrexham Maelor Hospital.
Dr Gill Richardson, Director of Public Health for Aneurin Bevan Health Board, said: “The four women in total now known to have had Hepatitis C transmission from the former healthcare worker are being offered care and support by our specialist services.
“We understand that this is a very difficult and distressing time for them and we would ask that everyone respects their need for compassion and confidentiality.
“We are thankful that we have been able to reassure other women tested and are grateful to all the patients who came forward to take the test.”
Patients who had or may have received treatment from the healthcare worker were contacted by letter and asked to come forward and have a blood test for Hepatitis C.
The patients were identified following a review of clinical records and a review of patients already in hepatology services.