Summary

• In week 20 of 2017 (May 15–21), emergency department visits for all causes increased among children aged 2–14 (+4%) and remained stable in other age groups. Hospitalizations increased by 3.5% among children under 15 and by 3% among adults aged 15–74 (remaining stable among those aged 75 and older).

• Seasonal spring and summer illnesses are mostly on the rise, at levels comparable to those of previous years. In particular, the following are noted: - across all age groups, an increase in visits for general malaise (+24% among those under 15 and +7% among adults), isolated fever (+10% among 2-14-year-olds, +8.8% among adults), conditions directly related to heat, and insect bites. The proportion of visits due to malaise among children was higher than in the previous two years over the past week. - Among adults aged 15–74, an increase in visits was also observed for viral meningitis, with a higher proportion of cases within total coded activity compared to the previous two years.

• The most frequently seen conditions in emergency departments (excluding seasonal conditions) remained stable or declined over the past week, except for visits due to trauma among those aged 15–74 (+6.2%).