COVID-19 pandemic period, where are the seasonal viruses?

International audience; The whole world has been struggling to cope with the SARS-CoV-2 pandemic since the beginning of 2020.The measures initially used to combat the epidemic were nonpharmaceutical, such as physical distancing, mask wearing, tightened basic hygiene, quarantine, and even curfews. These measures were applied, accepted, and effective to varying degrees, depending on the country.Their application did reduce the transmission of SARS-CoV-2 and decreased the virus reproductive number R0. However, the epidemic flared up from time to time and new waves of epidemic appeared, undoubtedly due to noncompliance and/or the partial lifting of containment measures such as curfews and movement restriction.