Key points

• Late onset of the epidemic (two to three months later) compared to previous seasons

• A larger and longer-lasting epidemic than in previous years

• End of the epidemic phase in S41 (mid-October), but viral circulation still higher than in previous years

  • 810 emergency department visits recorded through week 42; 38% of hospitalizations were secondary to these visits over the entire period

  • 236 RSV (Respiratory Syncytial Virus) cases detected through virological surveillance in 2021

• Start of the epidemic in mainland France (twelve regions in the epidemic phase in Week 43)