Key Points

• In Week 18 (April 28–May 4, 2025), which coincided with the start of the school year for Zone C, emergency department visits and subsequent hospitalizations were on the rise among children aged 2–14 (+12%, or 6,859 more visits, and +4%, or 226 more hospitalizations) and remained stable in other age groups.

• Across all age groups, there was an increase in visits due to trauma (+13%, or +10,050 visits), as well as for seasonal conditions: allergies (+7%, or +170 visits) and insect bites (+78%, or +295 visits).

• We also note, in connection with rising temperatures, an increase in visits for hyperthermia/heatstroke (138 visits in S18 vs. 17 visits in S17), dehydration among 2- to 14-year-olds (+35%, or +17 visits) and 15- to 74-year-olds (+15%, or +12 visits), urinary tract infections in children (+16%, or +114 visits) and those aged 75 and older (+8%, or +123 visits), and isolated fever (+11%, or +428 visits across all ages).

• Among children aged 2–14, there was also an increase in visits for asthma attacks (+16%, or +159 visits), general malaise (+15%, or +69 visits), scarlet fever (+41%, or +26 cases), conjunctivitis (+37%, or +83 visits), and skin infections (+9%, or +65 visits). Finally, visits for chickenpox increased among children under 2 years of age (+12%, or +13 visits), though at levels lower than in previous years.