The use of whole-blood spots on filter paper for the detection of antibody to human immunodeficiency virus type 1 (HIV-1) was evaluated during a 20-week period under a variety of storage environments simulating the harsh tropical field conditions in Kinshasa, Zaire. During the first 6 weeks of storage, all replicates of highand low-titer HIV-1-positive reference samples remained positive by enzyme immunoassay and Western blotting (immunoblotting), and all replicates of HIV-1-negative samples remained negative under all storage conditions. However, hot and humid storage conditions for up to 20 weeks caused a progressive decline in enzyme immunoassay optical density ratio values, which was particularly noticeable in samples with a low HIV-1 antibody titer. Harsh tropical operational conditions did not cause any repeatedly false-positive results during the 20-week storage period. The use of gas-impermeable bags with desiccant for the storage of blood spots on filter paper improved the stability of HIV-1 antibody detection over time and is recommended for the storage of whole-blood spots on filter paper in harsh tropical field settings.
IDU have played a major role in the spread of HIV in Europe. In several western European countries, the incidence of HIV acquired through drug use has declined following high rates in mid-1980s. Studies to assess current transmission are needed and prevention efforts must be maintained. In eastern Europe, emerging epidemics reinforce the urgency for prevention.
Objective-To examine the potential impact of deferral ofblood donors at high risk of HIV infection in a west African city where blood is screened for HIV antibodies but no other special measures are taken to protect the blood supply. Design-Cross sectional study. Setting-National Blood Transfusion Centre and Project RETRO-CI, an international collaborative AIDS research project, Abidjan, Cote d'Ivoire. Subjects-1257 male first time blood donors. Interventions-Blood donors were interviewed about demographic and behavioural characteristics and tested for HIV antibodies by enzyme immunoassay and, ifpositive, synthetic peptide based tests. Main outcome measures-HIV antibody status in relation to presence of behavioural risk factors; calculation of sensitivity, specificity, and predictive values of specific criteria for excluding HIV infected donors. Results-The overall prevalence of HIV infection was 11.4%. The most important risk factors for HIV positivity were prostitute contact and being aged 30-39 years. For identifying seropositive donors individual criteria had sensitivity, specificity, and positive predictive values ranging from 15% to 98%, 38% to 91%, and 17% to 300/o respectively. Prostitute contact in the past five years would have excluded 31% of all donors and 730/o of HIV infected donors. 27% of those excluded would have been HIV positive. Conclusions-The widespread assumption that donor deferral is not feasible in sub-Saharan Africa needs reassessment. In Abidjan this approach was well accepted and potentially effective. Donor deferral requires evaluation as a strategy for improving blood safety in resource poor areas with high rates of HIV infection.
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