Jean-François Delfraissy (head of french government’s Covid-19 scientific council):
"This virus is really special. We realized that the lifespan of protective antibodies against Covid-19 is very short. And we are seeing more and more cases of recurrence in people who have already had a first infection."
So no one is really protected against coronavirus, not even who has already fallen ill?
"It seems so. That's why our committee no longer recommends an immune license, a kind of pass for those who have had a first infection."
https://www.repubblica.it/cronaca/2020/04/12/news/coronavirus_infettivologo_macron-253823225/