Stock Photo - 16 November 2020, Berlin: Carolyn Krause, study assistant waits for study participants in the test bus. For the coronavirus antibody study ""CORONA-MONITORING local"" of the Robert Koch Institute, invited adults are examined for antibodies, a throat swab is taken and their health is questioned. Photo: Britta Pedersen/dpa-Zentralbild/ZB. - Berlin/Berlin/Germany

Stock Photo: 16 November 2020, Berlin: Carolyn Krause, study assistant waits for study participants in the test bus. For the coronavirus antibody study ""CORONA-MONITORING.

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