5,500 women across Wales are being contacted over fears that they may have been passed the Hepatitis C virus by a healthcare worker.
Patients will receive letters, offering them advice and a blood test. The tests begin on Friday, and continue for the next few weeks.
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The decision comes after a campaign led by Plaid Cymru and Rhondda Cynon Taf councillor Elyn Stephens to eradicate period poverty.
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