Overview

• Ontario logged 12 new measles infections this week, marking a steep drop from 33 cases last week and 96 the week before.
• Northern Ontario’s Sault Ste. Marie region reported two of the new infections, maintaining a persistent cluster there.
• Southwestern Ontario, the area hardest hit this spring, added four more measles cases despite the overall downward trend.
• Since an outbreak linked to travel from New Brunswick began in October 2024, Ontario’s cumulative total has reached 2,223 cases.
• Alberta health authorities recorded 64 new measles cases this week, raising the province’s total to 1,169 and keeping it second highest nationwide.