[New virus, new disease... and new challenges].

Since the emergence of the new coronavirus in China at the end of 2019 and its spread across five continents, our lives have changed. Confinement, state of health emergency, barrier gestures, physical distancing, etc., an arsenal of unprecedented measures has been put in place in France to break the chains of transmission of the virus and prevent the subsequent disease, COVID-19. A look back at these extraordinary events and what we know (or don't know) about the pandemic.