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Occult and active hepatitis B virus detection in donated blood in São Paulo, Brazil

The present study determined the HBV antigen, antibody, and DNA status in blood donations deemed to be HBV positive. Individuals with an occult HBV infection (OBI), defined as being positive for HBV DNA but negative for HBV surface antigen (HBsAg), as well as those with active infection (HBsAg‐positive), were identified and characterized.