title: A prospective study of the risk of transfusion-acquired viral infections.
abstract: The risk of transfusion-transmitted viral infections may be estimated by several methods, but only prospective studies of transfusion recipients can directly measure the incidence, with associated 95% upper confidence bound, of these infections. From 1989 through 1995, 764 recipients of allogeneic or autologous red blood cell transfusions were enrolled; 486 (64%) provided both pretransfusion and 6-month follow-up specimens. Both specimens were tested for anti-HBc, anti-HCV, anti-HTLV-I and anti-HIV, with appropriate confirmatory testing. Thirty-nine (8.0%) subjects had seroprevalent anti-HBc, 19 (3.9%) subjects had seroprevalent anti-HCV, three (0.6%) subjects had seroprevalent anti-HTLV-I/II, and one (0.2%) subject had seroprevalent anti-HIV. There were no seroconversions for any agent among the 34 patients who received only autologous blood, and no confirmed seroconversions for anti-HTLV-I or anti-HIV among all subjects. There were three seroconversions for anti-HBc (incidence 1.04 x 10(-3); 95% confidence interval (CI) 2.15 x 10(-4), 3.05 x 10(-3) per allogeneic unit transfused), and two confirmed seroconversions for HCV (incidence 6.94 x 10(-4); 95% CI 8.34 x 10(-5), 2.51 x 10(-3) per allogeneic unit transfused). One of the two anti-HCV seroconversions occurred in March 1994, after the institution of HCV EIA 2.0 screening of donated blood. Transfusion-associated seroconversions to hepatitis B and C markers were observed at low rates in the early 1990s despite testing donors for markers of both viruses, whereas seroconversions to HTLV-I or HIV were less than 1.04 x 10(3) per allogeneic unit transfused, based upon the upper 95% confidence interval of the zero incidence in this study.
authors.affiliation: Department of Laboratory Medicine, University of California San Francisco 94143-0884, USA. murphy@labmed.ucsf.edu
authors.forename: E L
authors.initials: EL
authors.lastname: Murphy
authors.forename: M P
authors.initials: MP
authors.lastname: Busch
authors.forename: M
authors.initials: M
authors.lastname: Tong
authors.forename: P
authors.initials: P
authors.lastname: Cornett
authors.forename: G N
authors.initials: GN
authors.lastname: Vyas
mesh_terms: D000328:Adult; D001804:Blood Transfusion, Autologous / Q000009:adverse effects; D002140:California / Q000453:epidemiology; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006678:HIV / Q000276:immunology; D015483:HIV Antibodies / Q000097:blood; D006679:HIV Seropositivity / Q000097:blood; D015528:HIV Seroprevalence; D016174:Hepacivirus / Q000276:immunology; D006515:Hepatitis B virus / Q000276:immunology / Q000302:isolation & purification; D015368:Human T-lymphotropic virus 1 / Q000276:immunology; D015367:Human T-lymphotropic virus 2 / Q000276:immunology; D006801:Humans; D008297:Male; D018580:Mandatory Testing; D008875:Middle Aged; D011446:Prospective Studies; D012307:Risk Factors; D065227:Transfusion Reaction; D014777:Virus Diseases / Q000097:blood / Q000453:epidemiology* / Q000209:etiology*
chemical_list: D015483:HIV Antibodies