As France starts the last step of the lockdown exit process on June 30, Pr. Jean-François Delfraissy thinks "there will be a 4th wave" this fall "but more more moderate than the first 3". "Vaccines are working against the delta variant, if two injections have been given. Hence the message: you need to get vaccinated, and get both injections by Fall", the Head of the Scientific Committee insisted on this Wednesday morning on France Inter.