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Covid-19: what does the incidence rate show us?


FIG DATA – It is one of the most important criteria to assess the frequency and speed of appearance of new cases.

The incidence rate corresponds to the number of positive Covid-19 cases per 100,000 inhabitants. The formula used to calculate this famous rate is as follows: number of positive people multiplied by 100,000, the whole divided by the number of inhabitants of the area studied. It is this figure that tilts a department in the red. Earlier than hospital data, this indicator lists the results of virological tests (RT-PCR tests, antigen tests, etc.).

This rate is one of the most important criteria to assess the frequency and speed of appearance of new cases. Conversely, the incidence rate does not determine the severity of their condition, while it can be used to assess the number of people infected.

When the incidence rate exceeds 10 positive cases per 100,000 inhabitants over seven days, the department reaches a first “vigilance threshold“. Beyond 50 positive cases in a week, we reach the “alert threshold“.

We can follow the daily evolution of the incidence rate at the national level but also at the regional and even departmental level. It can also be viewed by age group.

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