Key Points

• 685,858 possible cases of reinfection identified between March 2, 2021, and March 20, 2022, 95.2% of which occurred since December 6, 2021 (when the Omicron variant began spreading in France)

• 50% of possible reinfection cases were aged 18 to 40

• 88% of possible reinfection cases for which a screening result was available and interpretable for the reinfection episode had a result suggestive of Omicron

• 5.4% of confirmed COVID-19 cases were possible reinfections in S11-2022