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. 2021 May 15;787:147483. doi: 10.1016/j.scitotenv.2021.147483

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© 2021 The Authors

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 1 — Evolution of cases and clusters through time. The vertical dashed lines delimit the Swiss lockdown period (March 16 to April 27). (A) Epidemic trajectory of positive tests. The daily new confirmed cases are represented in dark blue and the percent of positive tests are represented in light blue. (B) Number of case clusters over time. The total number of clusters detected daily by space-time scan statistics are represented in dark blue, and the red and grey lines represent the proportion of significant clusters (p ≤ 0.05) and non-significant clusters (p > 0.05), respectively. (C) Average relative risk of significant space-time clusters (p ≤ 0.05) over time according to within-cluster cases. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)