Overview

• New federal and provincial tallies put Canada at 4,638 measles cases, with Alberta at 1,790 this year—exceeding the entire U.S. confirmed total of roughly 1,356–1,375.
• Freedom-of-information documents show Alberta Health Services often awaited government sign-off for steps such as hospital visitor restrictions, slowing the early response as cases seeded from travel and a Mennonite wedding.
• WHO/PAHO data indicate most confirmed cases involve people who are unvaccinated, and Canadian investigators link large clusters to Anabaptist/Mennonite communities and an initial wedding exposure in New Brunswick.
• Public-health officials flag immunity gaps as schools reopen, noting California has 16 counties below the ~95% MMR threshold and Utah’s kindergarten coverage has fallen, even as two MMR doses offer about 97% protection.
• Utah reports four weeks without a new case and is pausing weekly updates but warns classrooms could restart transmission; U.S. experts caution official counts likely understate infections, and California has reported three measles deaths this year.