the R0 is less than 1 in all regions

Since the start of the coronavirus epidemic (in January 2020 in Asia) there has been a lot of talk about the effective R, an indicator presented as a reflection of the speed of spread of Sars-Cov-2, the virus responsible for the Covid-19 disease . But what is it exactly?

In medical parlance, the effective R0 or R is said to be the basic reproduction rate of a virus. Clear : “this is the number of people who can potentially be infected by an individual infected with a virus“explains Dr. William Berrebi, gastroenterologist and hepatologist, and former intern at the Hospitals of Paris.

The R0 indicator is therefore not specific to the Sars-Cov-2 coronavirus: it can be measured for any viral epidemic. “At the height of the coronavirus epidemic, at the end of March 2020, the R0 was 3 which means that each infected person could transmit the virus to around 3 other people., says Dr. Berrebi. For comparison, the R0 of the measles is 16 and that of the gastroenteritis is 17: these are viruses that circulate much more easily than Sars-Cov-2 in the population.

In the context of re-containment in force since November 30, the Institut Pasteur is considering several scenarios depending on whether the measures to restrict social contacts will be well respected or a little less followed by the population and therefore less effective. The indicator of the success of this new confinement is therefore (…)


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