Key Points

• A very significant, rapid, and early increase in bronchiolitis surveillance indicators among children under 2 years of age, with most indicators showing a further rise compared to the previous week

• Very high numbers of emergency department visits and hospitalizations for bronchiolitis, exceeding levels observed during the epidemic peaks of the previous three seasons and already matching those of the peak of the 2018–2019 season

• The bronchiolitis epidemic has now spread to all metropolitan regions, with Corsica entering the epidemic phase, and with a more pronounced intensity in northern France