Key Points

• Increase in the number of cases since 2023, with a marked rise in invasive meningococcal infections (IMI) of serogroups W and Y among adults

• High incidence of IIM B in infants

• High case-fatality rate for IIM W compared to other serogroups

• Mandatory vaccination against IIM B and ACWY for infants since 2025

• Vaccination campaign against serogroups ACWY in middle schools and long-term care facilities starting in January 2026