(a)Number of samples analysed for SARS-CoV-2 viruses and proportion of positive SARS-CoV-2 detections (positive rate) by CW in the Bavarian Influenza Sentinel 2020/2021 in Bavaria, Germany. Grey bar: negative swabs, orange bars: SARS-CoV-2 positive swabs. Black line: positive rate, dashed lines: upper and lower 95% confidence interval (ci). Note: The second lockdown-‘light’ in Germany started in CW 44/2020. It was replaced by a hard lockdown in CW 51/2020, which lasted until CW 10/2021. (b) SARS-CoV-2 positive rate by CW in the Bavarian Influenza Sentinel 2020/2021 (BIS, dotted line), the four-week average positive rate in BIS (black line) and the positive rate from the Bavarian Health and Food Safety Authority (LGL) mass testing (blue line).