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Anti-SARS-CoV-2 IgG antibody detection rates among first-time tested participants at different stages of pandemic. In the background, the official statistics of new daily cases (in thousands of cases) of COVID-19 in Moscow are presented [2]. At the bottom of the timeline, the duration of the study is marked in green. * the proportion of vaccinated among seropositive is unknown; ** the proportion of vaccinated among seropositive participants was 4.8% (6/123).
