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Professor Jean-François Toussaint was at the Futurapolis Santé Montpellier event on Saturday, October 10, an opportunity for him to return to the Covid-19 epidemic by taking stock of some figures. https://bit.ly/3k1otmn Where is the collective immunity in France? What we understand from this epidemic, like all others, is that it is that of an arms race, on the one hand, as well as the increase in adaptive and defense capacities, on the other. And the mutation rate of the virus does not show for the moment a very different value in its aggressiveness. On the other hand, it opposes changes in terms of population immunity. We have two examples: that of Sweden, which has not confined and which sees its current immunity rate around 40 to 45% established and without any new increase, for the moment, in its mortality rate. And, in the same way, the current phase in France, which is a much lower value than the one we experienced in the spring, tells us that we are perhaps seeing this collective immunity taking place in the population. And this is also demonstrated by the positivity rate which continues to rise while we are now carrying out more than a million tests per week, that is to say on a sample which is starting to become very representative of the French population. Are all countries equal in the face of Covid-19? What we see is that developing countries have had a mortality rate ten times lower per million inhabitants compared to developed countries. And these developed countries – whether in European countries (Spain, Italy, France) or in the eastern states of the United States – show a very important link with the increase in life expectancy which is ultimately the result of this economic development and the nutritional, hygiene and medical capacities offered to populations. This link, at the same time as it allowed life expectancy to increase, constituted a very important class of the very vulnerable population and it is this one that was the target of the virus. This target was not found in emerging countries.