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yesterday

North American Measles Outbreak Expands as Cases Surge in Kansas and Ontario

Sedgwick County, Kansas, reports its first measles case in eight years, while Ontario sees nearly 200 new cases in a week, underscoring vaccination gaps.

Public health nurse Lauri Bidinot demonstrates how to give a measles shot to a young girl at Southwestern Public Health in St. Thomas, Ont. on Tuesday, March 4, 2025.THE CANADIAN PRESS/ Geoff Robins
A measles, mumps and rubella vaccine is prepared at the Andrews County Health Department in Andrews, Texas, on April 8.
Public health officials reported a measles case in Sedgwick County.
State Department of Health Commissioner Dr. James McDonald gives an update on the statewide response to recent measles outbreaks during a press conference on Wednesday, March 19, 2025.

Overview

  • Sedgwick County, Kansas, confirmed its first measles case since 2017 in an unvaccinated child, contributing to the state's 48 reported cases.
  • Ontario's measles outbreak has reached 1,440 cases, with 197 new infections reported in the past week, primarily among unvaccinated populations.
  • Alberta's case count has climbed to 313, with health experts warning of exponential growth due to low vaccination rates in certain regions.
  • Nationwide, the U.S. has reported 935 confirmed measles cases as of May 1, with outbreaks concentrated in 29 states and driven by unvaccinated children and teens.
  • Public health officials are intensifying vaccination campaigns, urging early and additional doses of the MMR vaccine to curb the spread of the highly contagious virus.