Serological tests for the detection of specific antibodies to SARS-CoV-2 are an important tool both for confirming the diagnosis and for the epidemiological investigations. Comparative analysis of ELISA test kits for qualitative determination (yes/no) of IgG antibodies to SARS-CoV-2 available for purchase in the Republic of Belarus was done. The study included four commercial kits of various manufacturers: Vector-Best, Russia; N. F. Gamalei Research Center, Russia; Algimed, Belarus; Wuhan Fine Biotech, China. All test kits showed high quality in detection of specific IgG. The kits produced by Vector-Best, Russia, and Wuhan Fine Biotech, China had the highest sensitivity (100.0 %); the kits produced by Algimed, Belarus, had the greatest specificity (100.0 %). The dependence between the optical density of the samples and the concentration of IgG to SARS-CoV-2 was evaluated. The results showed that it is not possible to make a conclusion about the amount of antibodies based on the optical density of the sample in the test kits designed for their qualitative determination.
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