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. 2021 Mar 12;8:636160. doi: 10.3389/fmed.2021.636160

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Copyright © 2021 Hanrath, Schim van der Loeff, Lendrem, Baker, Price, McDowall, McDowall, Cook, Towns, Schwab, Evans, Dixon, Collins, Burton-Fanning, Saunders, Harwood, Samuel, Schmid, Pareja-Cebrian, Hunter, Murphy, Taha, Payne and Duncan.

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Changes in PCR test positivity over time. (A) Total SARS-CoV-2 PCR tests in HCWs. Filled bars = positive tests. Open bars = negative tests. (B) Per test positivity (%), displayed as daily (blue line) or 7 day average (black line).