Key Points

This report on SARS-CoV-2 presents the epidemiological situation before and after the emergence of the Omicron variant between March 2020 and February 2023:

• Continuous circulation causing epidemic waves of varying magnitude

• No distinct seasonal pattern to date, with resurgences linked to various factors (emergence of a variant, return to school, large gatherings, etc.)

• A sharp increase in surveillance indicators in late 2021 linked to the emergence of the Omicron variant, followed by the circulation of sublineages of this variant with similar characteristics (high transmissibility, immune escape capacity, but lower severity)

• Trends in epidemiological indicators similar to those observed at the national level