Also, we detected anti-SARS-CoV-2 in January 2020, indicating that the SARS-CoV-2 could have been imported during the first month of 2020. We provide an estimate of the exposure of healthy blood donors in Luanda. The infection was higher in blood group A and lower in blood group O. Blood donors under the age of 20 years (OR: 4.58, p = 0.241) and from non-urbanized areas (OR: 1.86, p = 0.293) presented a high risk related to infection. Past and recent infections were detected in 3.2% and 1.5%, respectively. Seroprevalence of anti-SARS-CoV-2 was 4.7%. Chi-square and logistic regression were calculated to predict the independent variable for SARS-CoV-2 infection and deemed significant when p < 0.05. This was a retrospective study conducted with 343 blood donors. Herein, we estimated the seroprevalence of anti-SARS-CoV-2 antibodies and risk factors among blood donors in Luanda, the capital city of Angola. The exposure rate in the healthy population is unknown, mainly in resource-limited countries. SARS-CoV-2 emerged in China and spread throughout the world due to its rapid transmission.
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