Overview

• Texas is experiencing its largest measles outbreak since elimination, with 702 cases, 91 hospitalizations, and two child fatalities as of May 6, 2025.
• In Alberta, 265 cases have been confirmed, with 90% occurring in unvaccinated individuals and three children currently in intensive care.
• Vaccination rates in Alberta’s central and southern zones remain below the 95% herd immunity threshold, ranging from 72% to 90%.
• Authorities in Alberta have expanded clinic hours, launched a measles hotline, and announced a multilingual public awareness campaign starting mid-May to boost immunization rates.
• The U.S. has recorded 935 measles cases across 30 states this year, a sharp increase from the 285 cases reported in 2024, with experts warning of the risk of endemic transmission if vaccination rates do not improve.