Key Points

Monitoring of regional indicators indicates that activity related to bronchiolitis among children under 2 years of age is on the rise. This trend is also being observed in mainland France by Santé publique France. Virological surveillance by laboratories at the Caen and Rouen university hospitals shows the beginning of respiratory syncytial virus (RSV) circulation and significant but declining rhinovirus circulation.Given the current school vacation period, a temporary decline in these trends is expected prior to a sharp resurgence starting in week 2017-45, as observed during previous seasonal epidemics. Monitoring in the coming weeks will confirm this trend.