Key Points

• The 2023–2024 season in Hauts-de-France was marked by less severe outbreaks of influenza and bronchiolitis than in 2022–2023.

• The scale of these outbreaks was similar to those observed before the COVID-19 pandemic.

• Indicators of acute gastroenteritis were at levels similar to those seen before the COVID-19 pandemic, with rotavirus being the predominant cause.