A majority of clusters had a high level of criticality in elderly care structures (82.2%), in disability care centres (56.6%), and health care facilities (51.7%). Among all reported clusters, 43.1% had a high level of criticality with significant differences between communities ( p < 0.0001). This trend mirrors change of transmission pattern overtime according to social contacts. Clusters reported in occupational environment and the personal sphere had increased during summer while clusters reported in educational environment increased after the start of the school year. We show a shift over time of the most affected communities in terms of number of clusters. ResultsĪ total of 7236 clusters were reported over the study period, particularly in occupational environment (25.1%, n = 1813), elderly care structures (21.9%, n = 1586), and educational establishments (15.9%, n = 1154). We compared the level of criticality according to the type of community in which the cluster occurred using Pearson’s chi-square tests. ![]() A level of criticality was defined for each cluster to take into consideration the risk of spreading within and outside the community of occurrence, and the health impact within the community. This surveillance system identified the most affected communities in a timely manner. Clusters were registered in a national database named “MONIC” (MONItoring des Clusters), established in May 2020. In this study we describe the typology and criticality of COVID-19 clusters between the two lockdowns implemented in France (between May and end of October 2020). ![]() The aim of this study was to describe the typology and criticality of clusters reported between the two lockdowns in France to guide future action prioritisation. ![]() We developed a reporting system of clusters defined as at least three COVID-19 cases, within seven days and belonging to the same community or having participated in the same gathering, whether they know each other or not. In France, the lifting of the lockdown implemented to control the COVID-19 first wave in 2020 was followed by a reinforced contact-tracing (CT) strategy for the early detection of cases and transmission chains.
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