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Origins of positive or inconclusive samples for anti‐SARS‐CoV‐2 antibodies within Germany. Doubtful results are displayed in parenthesis. (a) ELISA‐positive specimens confirmed by indirect immunofluorescence test (n = 20). (b) Sera which were found to be positive or inconclusive by ERBD (n = 24). (c) Samples that tested positive or inconclusive in ENC (n = 6)
