Stock Photo - 26 January 2022, Bonn: A graph shows the amount of coronavirus RNA found in the laboratory CBT in relation to the number of propagation runs (CT value). For positive tests, the graph rises steeply; for negative tests, it remains flat. (to dpa ""Bonn lab director: understanding for test strategy, but also criticism"") Photo: Henning Kaiser/dpa. - Bonn/Germany

Stock Photo: 26 January 2022, Bonn: A graph shows the amount of coronavirus RNA found in the laboratory CBT in relation to the number of propagation runs (CT value).

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