title: The Sydney Blood Bank Cohort: a case-control study using a transfused HIV-1 seronegative group.
abstract: OBJECTIVE
  To compare the immunological function of the Sydney Blood Bank Cohort (SBBC), a unique group of individuals who were all infected with a similar, attenuated strain of HIV-1, with a matched HIV-1 seronegative control group. To establish whether the asymptomatic state of the SBBC, in 1996, was likely to continue, and whether the SBBC were free from immunological signs of disease progression.
  
  
  METHODS
  A prospective case-control design using a matched transfused HIV-1 seronegative control group. Immunological testing was performed and compared across the groups. These measurements included CD4+, CD8+, CD3 + subsets, total lymphocytes, beta-2-microgloublin (beta2M), and neopterin.
  
  
  RESULTS
  Significant differences were observed between the SBBC and the controls, particularly CD4% (p < 0.05), CD8 counts (p < 0.01), and CD4:CD8 ratios (p < 0.001).
  
  
  CONCLUSIONS
  The results suggested that, as a group, the SBBC remained asymptomatic 12 to 16 years after infection with HIV-1. However, elevated CD8+ T lymphocytes, together with decreasing CD4%, suggested that some SBBC members were showing early immunologicalsigns of disease progression during late 1996, confirmed by recent (1998) follow-up studies.
authors.affiliation: Australian Red Cross Blood Service-NSW, Sydney, New South Wales.
authors.forename: L B
authors.initials: LB
authors.lastname: McIntyre
authors.forename: A F
authors.initials: AF
authors.lastname: Geczy
authors.forename: W B
authors.initials: WB
authors.lastname: Dyer
authors.forename: J C
authors.initials: JC
authors.lastname: Learmont
authors.forename: J S
authors.initials: JS
authors.lastname: Sullivan
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000175:diagnosis / Q000276:immunology / Q000635:transmission*; D001315:Australia; D001771:Blood Banks; D017252:CD3 Complex / Q000032:analysis; D015704:CD4 Antigens / Q000032:analysis; D016827:CD8 Antigens / Q000032:analysis; D016022:Case-Control Studies; D002851:Chromatography, High Pressure Liquid; D015331:Cohort Studies; D003627:Data Interpretation, Statistical; D005455:Fluorescent Antibody Technique; D005500:Follow-Up Studies; D018023:HIV Seronegativity; D015497:HIV-1; D006801:Humans; D007124:Immunoenzyme Techniques; D008214:Lymphocytes / Q000276:immunology; D019798:Neopterin / Q000097:blood; D011446:Prospective Studies; D016176:T-Lymphocyte Subsets / Q000276:immunology; D013997:Time Factors; D065227:Transfusion Reaction; D001613:beta 2-Microglobulin / Q000032:analysis
chemical_list: D017252:CD3 Complex; D015704:CD4 Antigens; D016827:CD8 Antigens; D001613:beta 2-Microglobulin; D019798:Neopterin