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Monthly anti-SARS-CoV-2 IgG seroconversion rates among 100 participants monitored between June 2020 and June 2021. Note: Participants vaccinated against the background of the detectable post-exposure antibodies are still assigned to the «IgG + after infection» group on the graph. All seropositive participants who did not come to the testing in the following months continued to be counted as IgG +, if remained positive in the last test.
