Since March 4, 23 departments have been under close surveillance, in the north and east of the country.
After the partial confinements of Nice, the coast of the Alpes-Maritimes, Dunkirk and Pas-de-Calais, will they in turn be the target of new restrictions to curb the spread of the Covid?
How to know in which direction their health situation will evolve, when the impact of the circulation of the virus takes more than a week to be reflected on the usual indicators of monitoring of the epidemic?
An early indicator provides an element of the answer: the virus concentration in wastewater.
A person infected with Covid will indeed excrete the virus in their stool even before developing any symptoms (and therefore being tested
a priori
).
The quantities of virus present in the water from wastewater treatment plants can thus give an idea of its level of propagation, one step ahead of the epidemic curves.
In Nice, for example, the incidence rate
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