Opt-out testing for blood-borne viruses in primary care: a multicentre, prospective study.

Background: Hepatitis B (HBV), hepatitis C (HCV), and HIV blood-borne viruses (BBV) are associated with chronic ill health and mortality. Early diagnosis reduces disease transmission, delays progression, and improves outcomes. Routine opt-out testing for BBV in primary care may be viable in identifying unknown disease.