Key Points

Seasonal outbreak of persistent bronchiolitis in Réunion during week 25 of 2021 (June 21–27):

• Decrease in emergency room visits in June

• Increase in hospitalizations in week 25 (+25%)

• 10 consecutive weeks of the outbreak

• In week 25 of 2021, among children under 2 years of age:

  • 62 emergency room visits for bronchiolitis, representing 21% of total activity.

  • 35 visits for bronchiolitis were followed by hospitalization, representing 56% of all emergency room visits

• Increase in the number of RSV cases detected at the university hospital