title: Human herpesvirus 8 seroprevalence and viral load in healthy adult blood donors.
abstract: BACKGROUND
  Human herpesvirus 8 (HHV-8) is widely suspected to be a human tumor virus because it is associated with Kaposi's sarcoma and primary effusion B cell lymphoma. Report of a case of HHV-8-positive donor blood in the US has led to concern for the safety of donor blood from HHV-8-seropositive donors.
  
  
  METHODS
  The findings of HHV-8 seroprevalence and virus load from 100 randomly selected blood donors from the Houston, Texas, area are reported. Serology with serial titration was performed using a highly sensitive indirect immunofluorescence assay to lytic and latent HHV-8 antigens. For detection of blood-borne virus, buffy-coat DNA was subjected to two ultrasensitive nested PCR-dot blot assays to HHV-8 orf26 and orf72 regions.
  
  
  RESULTS
  At a screening titer of 1 in 10, nearly one-quarter (23%; 95% CI, 15-33) of the blood donors are HHV-8 seropositive with a geometric mean titer of 1 in 53. Seroreactivity to lytic antigens (23%) greatly exceeded that to latent antigens (5%). There was a significant association between seropositivity and older age (p < 0.02), white ethnicity (OR, 3.33; 95% CI, 1.40-7.95) and ABO blood group B (OR, 6.44; 95% CI, 2.46-16.80). No association with sex or CMV seropositivity was demonstrated. No HHV-8 viremia was detected, even though 64 percent of tested donor blood samples were EBV DNA positive.
  
  
  CONCLUSIONS
  Despite a relatively high HHV-8 seroprevalence in this cohort of Houston area blood donors, HHV-8 DNA was not detected in any sample of donor whole blood using a highly sensitive PCR assay. Thus, at least in the southeast Texas region, large-scale screening of blood donor units for HHV-8 antibody or DNA seems unwarranted.
authors.affiliation: Department of Pathology, University of Texas Medical Branch, Galveston, 77555-0741, USA. shudnall@utmb.edu
authors.forename: S David
authors.initials: SD
authors.lastname: Hudnall
authors.forename: Tiansheng
authors.initials: T
authors.lastname: Chen
authors.forename: Peter
authors.initials: P
authors.lastname: Rady
authors.forename: Stephen
authors.initials: S
authors.lastname: Tyring
authors.forename: Paul
authors.initials: P
authors.lastname: Allison
mesh_terms: D000017:ABO Blood-Group System; D000328:Adult; D000914:Antibodies, Viral / Q000097:blood*; D001782:Blood Donors; D005260:Female; D019288:Herpesvirus 8, Human / Q000276:immunology* / Q000302:isolation & purification*; D006801:Humans; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D016036:Seroepidemiologic Studies; D019562:Viral Load; D014766:Viremia / Q000453:epidemiology
chemical_list: D000017:ABO Blood-Group System; D000914:Antibodies, Viral