5,500 patients in several parts of Wales are being contacted by health boards this week, over fears that they may have been passed the Hepatitis C virus by a healthcare worker.
Obstetric and gynaecology patients will receive letters, offering them advice and a blood test for Hepatitis C.
The worker, who has now retired, is known to have transmitted the virus to two patients between 1984 and 2003.
They worked in the Aneurin Bevan health board area between 1984 and 2003, predominantly at Caerphilly District Miners' Hospital.
They also briefly worked at the East Glamorgan General Hospital in Pontypridd in 1984, and at Wrexham Maelor Hospital (known then as Maelor General Hospital) in 1978.
More top news
A man who has suffered from eating disorders for over 10 years has spoken out about the care he received in Wales.
A Cardiff artist with Asperger's syndrome who draws stunning photorealistic pictures been featured nationally.
Young people in Wales will be able to make use of Wales' new discount bus travel scheme for the first time today.