Summary

• During week 37 (September 11–17, 2017), the second week of the new school year, visits to emergency departments and subsequent hospitalizations increased by approximately 20% among children under 15 and remained stable in other age groups.

• Emergency room visits for most seasonal conditions were stable or declining, with the exception of visits for: - asthma attacks, which rose sharply (+130%, or +1,921 visits) among children under 15, with a higher incidence than in the previous two years, and to a more moderate extent among adults aged 15–74 (+41%), - viral meningitis among children under 15 (+78%, or 7 visits), - burns among children under 2 (+37%, or +51 visits) and among adults aged 75 and older (+36%).

• Among the most common conditions, there was a sharp increase in ENT infections among children under 15 (+80%) and, to a lesser extent, among adults aged 15–74 (+7%). Bronchiolitis also saw a sharp increase (+146%) for the fourth consecutive week. Also among children under 2 years of age, there has been an increase in visits for dermatological conditions (+27%). Among children aged 2–14, the same increases observed the previous week were seen, namely neurological disorders (+16%), abdominal pain (+13%), and trauma (+13%). Among adults aged 75 and older, there has been a 7% increase in visits for stroke, cardiac decompensation, pneumonia, dyspnea, respiratory failure, and malaise.