Abstract
Background: Transmission of HIV through blood transfusion remains a public health problem, particularly in countries in Sub-Saharan Africa. However, no study has determined the epidemiological data regarding HIV-1 infection in Gabonese blood donors. The objective of this study is to assess the seroprevalence of HIV-1 and the risk factors associated with infection in donors from the National Blood Transfusion Center in Libreville (Gabon).
 Methods: A cross-sectional study carried out from June to August 2020 in 3669 persons donating blood at the National Blood Transfusion Center (NBTC). The ELISA technique (Evolis®, BioRad), the chemiluminescence technique (Cobas® e601, Roche), and the SD Bioline® HIV 1/2 test (Standard Diagnostics. Inc) were used for the detection of anti-HIV-1/2 antibodies and P24 antigen in donor plasma. Data were analyzed using SPSS software version 21.0, with p˂.05 considered statistically significant. 
 Results: The seropositivity rate HIV-1 was 0.8% (30/3669) (95% CI: 0.5; 1.1). The study was composed of 79.4% men and 20.6% women. The most representative age group was of 25-34 years with 54.5%. The seropositivity of men, women, and unrelated voluntary donors was 0.7%, 1.2%, and 1.0%, respectively. The risk factors such as the first blood donation (Adjusted Odds Ratio (AOR) = 0.1 [0.0 ;0.4], P= .002), multiple sexual partners (AOR = 6.2 [2.2;17.2], P= .001), primary educational level (AOR = 10.1 [1.4;75], P = .024), and dental care (AOR = 3.6 [1.2;11], P = .024) were significantly associated with HIV infection. About 0.14% of the patients had co-infection.
 Conclusion: In the Gabonese context, about one out of a hundred blood donors are HIV-infected. These carriers of HIV infection in the blood banks are mainly new donors with multiple sexual partners, limited education, and poor dental care.
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