title: Recognition of cytomegalovirus clinical isolate antigens by sera from cytomegalovirus-negative blood donors.
abstract: BACKGROUND
  The most common way to prevent transmission of CMV by blood transfusion is to use blood products from seronegative donors. Screening of blood donors for CMV infection is usually based on detection of antigens obtained from the CMV laboratory strain AD 169. Recent evidence suggests that approximately up to 20 percent of CMV-negative blood donors may in fact be CMV-DNA positive by PCR analyses.
  
  
  METHODS
  In this study, sera from CMV-seronegative, CMV-seropositive, and CMV-DNA-positive/seronegative individuals, and from patients with acute and convalescent CMV infection for detection of CMV antibodies were analyzed. CMV antigens prepared from cells infected with CMV clinical isolates or the CMV laboratory strain AD 169 in ELISA and Western blot assays were used.
  
  
  RESULTS
  All CMV-positive sera from blood donors were seropositive for the CMV antigens prepared from AD 169 (A2) or from a CMV clinical isolate (C6). Interestingly, whereas all CMV-negative blood donors were negative in tests for the CMV antigen A2, 36 percent were CMV seropositive using the CMV antigen C6 in ELISA.
  
  
  CONCLUSIONS
  The data suggest that a substantial number of CMV-seronegative/CMV-DNA-positive serum samples contain antibodies that recognize CMV clinical isolate antigens.
authors.affiliation: Department of Medicine, Center for Molecular Medicine, and the Department of Laboratory Medicine, H5, Karolinska Institute, Stockholm, Sweden. afsar.rahbar@cmm.ki.se
authors.forename: A R
authors.initials: AR
authors.lastname: Rahbar
authors.forename: V-A S
authors.initials: VA
authors.lastname: Sundqvist
authors.forename: B Zweygberg
authors.initials: BZ
authors.lastname: Wirgart
authors.forename: L
authors.initials: L
authors.lastname: Grillner
authors.forename: C
authors.initials: C
authors.lastname: Söderberg-Naucler
mesh_terms: D000914:Antibodies, Viral / Q000097:blood*; D000956:Antigens, Viral / Q000276:immunology*; D001782:Blood Donors; D015153:Blotting, Western; D003587:Cytomegalovirus / Q000276:immunology*; D003586:Cytomegalovirus Infections / Q000635:transmission*; D004279:DNA, Viral / Q000097:blood; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral; D004279:DNA, Viral; D007074:Immunoglobulin G