COVID-19 hotspots through clusters analysis in France (may–October 2020): where should we track the virus to mitigate the spread?

Table 1 Epidemiological criteria to assess the level of criticality of the clusters

Epidemiological criteria	Category A	Category B	Category C
Number of cases	< 5	5 to 9	> 9
Ratio number for cases/community size	< 5%	10%	15%
Vulnerability factors	None	Medical^a	Social^b and medical
Severity factors	No hospitalisation and no death	Less than 5 hospitalisations, no death	More than 5 hospitalisations and/or ≥ 1 death
Time period between last case onset of symptoms and signal	≤7 days	8 to 14 days	14 days
Risk of spreading	Low	Moderate	High
Level of criticality	Low: only category A criteria Moderate: at least one category B criteria without C High: at least one category C criteria

^a Population with elderly people, people with comorbidities or with immunodeficiency
^b Disadvantage and fragile environment, people with difficulty accessing health care, language and/or cultural barriers

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