Abstract | BACKGROUND: After 3 years of individual-donation nucleic acid test (ID- NAT) screening by the South African National Blood Service (SANBS), a repository of 73 human immunodeficiency virus antibody (anti-HIV)-negative window period (WP)-yield samples and 28 anti-HIV-positive, HIV- RNA-negative elite controllers (ECs) became available for comparison of a p24 antigen (p24 Ag) assay (Innogenetics), two viral load assays (Siemens branch DNA [bDNA] 3.0 and Abbott real-time polymerase chain reaction [RT-PCR]), and three triplex NAT assays (Novartis Diagnostics Ultrio and Ultrio-Plus and Roche TaqScreen) by replicate testing of dilutions. STUDY DESIGN AND METHODS: Viral loads were assessed by bDNA and RT-PCR assays and if below 100 copies (cps)/mL, by Ultrio limiting dilution probit analysis. The probability of virus transmission by WP and EC donations was estimated for different levels of the 50% minimum infectious dose (ID50 ) using Poisson distribution statistics. RESULTS: The equal distribution of WP donations plotted by log HIV- RNA levels indicated a random appearance of donors in the ramp-up phase. The HIV p24 Ag assay detected 45% of WP samples and the cutoff crossing point was estimated at 8140 (bDNA)/22,710 (RT-PCR) cps/mL. On replicate retesting of 40 HIV p24 Ag-negative ID- NAT WP-yield samples Ultrio minipool (MP)8, Ultrio-Plus MP8, and TaqScreen MP6 detected 79, 81, and 78%, respectively. Modeling with an estimated ID50 of 31.6 virions/RBC indicated that 15% of p24 Ag-negative ID- NAT WP-yield donations would have transmitted HIV if MP6-8 NAT had been used. Only 2% of RBC transfusions from ECs are estimated to be infectious with a worst-case ID50 estimate of 316 virions. CONCLUSION: Our analysis of viremia and infectivity of WP and EC donations enables comparison of the efficacy of NAT options in preventing HIV transmission risk.
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Authors | Marion Vermeulen, Charl Coleman, Josephine Mitchel, Ravi Reddy, Harry van Drimmelen, Tracy Fickett, Michael Busch, Nico Lelie |
Journal | Transfusion
(Transfusion)
Vol. 53
Issue 10 Pt 2
Pg. 2384-98
(Oct 2013)
ISSN: 1537-2995 [Electronic] United States |
PMID | 23445273
(Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | © 2013 American Association of Blood Banks. |
Chemical References |
- HIV Core Protein p24
- RNA, Viral
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Topics |
- Algorithms
- Asymptomatic Diseases
- Blood Donors
(statistics & numerical data)
- Case-Control Studies
- HIV Core Protein p24
(analysis, blood, immunology)
- HIV Infections
(blood, diagnosis, transmission)
- HIV-1
(genetics, immunology, isolation & purification)
- Humans
- RNA, Viral
(blood)
- Real-Time Polymerase Chain Reaction
(methods)
- Risk Factors
- Serologic Tests
(methods)
- South Africa
- Viral Load
(methods, physiology)
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