Overview

• Ontario reported 173 new measles cases this week, bringing the total to 1,795 since the outbreak began in October 2024.
• Unvaccinated individuals, particularly infants, children, and adolescents, account for the majority of infections.
• The outbreak has resulted in 129 hospitalizations, including 10 patients admitted to intensive care units.
• Southwestern Ontario remains the hardest-hit region, with 98 of the new cases reported in Oxford County, Elgin County, and St. Thomas.
• Alberta is also experiencing a surge, with over 500 measles cases reported since March, signaling a wider national resurgence.