Summary

• In Week 21 of 2017 (May 22–28, which included a long weekend), emergency room visits and hospitalizations from all causes increased among children under 2 years of age (by 10% and 3%, respectively).

• Seasonal spring and summer illnesses are mostly on the rise across all age groups, at levels higher than those of the previous two years. In particular, there was an increase in visits for: - insect bites (+90% across all ages), - conditions directly related to heat (+50% across all ages), including 30% among those over 75 (dehydration followed by hyponatremia)- conjunctivitis (+49% across all ages), burns (+38% across all ages), and isolated fever (+21% across all ages), with a more pronounced increase among 2- to 14-year-olds (+132%, +74%, and +39%, respectively) Among children under 15, visits for viral meningitis continued to rise

• Among the most frequently seen conditions in emergency departments (excluding seasonal conditions), there was an increase in visits for ENT infections (+20%), except among those aged 75 and older, and urinary tract infections (+10%), except among those aged 2–14.In addition, there was an increase in visits among children under two for chickenpox (+50%) and dermatological conditions (+18%), and among those aged 15–74 for skin infections (+10%).