Key Points

• A heat wave affecting the Hauts-de-France region from June 19 to 22, 2017

• Moderate impact on emergency room visits and calls to SOS Médecins

• Moderate but not significant increase in mortality during or following this heat wave

• Nationally, reports of healthcare use and deaths among workers, as well as reports from schools

• Importance of reminding vulnerable populations, in particular, of preventive measures