Measles cases are increasing in Ontario. In total, between October 14, 2024 and May 6, 2025, officials confirmed 1,400 cases. The Eastern Ontario Public Health Unit (EOHU) has now made clear that these shocking numbers represent a public health emergency. This crisis is affecting every corner of the province.
Since April 29, 2015, public health officials have recorded 197 new cases of measles. The impact of that virus spread has been keenly felt, as cases have surged across 17 of Ontario’s 32 health units. None has been more urgently affected than southwestern Ontario, which has seen a staggering concentration of cases leading to immediate widespread public health responses.
Dr. Paul Roumeliotis, Medical Officer of Health at the EOHU, noted that vaccinations have been key in fighting this outbreak. He encouraged anyone who is behind on their immunizations to contact their health care provider.
“I am taking this opportunity to remind parents to make sure their children’s routine immunizations are up to date, as immunizations are the best defence against measles. If you or your child are not up to date on your vaccinations, please contact your health care provider to receive missing immunizations. The measles vaccine is safe, effective, and greatly decreases the chances of catching measles and bringing it home with you.” – Dr. Paul Roumeliotis, Medical Officer of Health at the EOHU.
As of the report on 6 May, 2025, there had been no known positive cases reported within the jurisdiction of the EOHU. Yet with the number of infections increasingly rapidly throughout the entire province, the negative impact is clear. Public health officials are keeping a watchful eye on the developing situation as they push to ramp up vaccination efforts.
Vaccination continues to be the most effective measure to prevent measles, something health units across Ontario want you to know. With the ongoing outbreak and new cases emerging daily, officials stress the urgency of ensuring that children and adults alike are protected through appropriate immunization.
Ontario is in the most dangerous health crisis. That’s why community awareness and action are more important than ever to stop the virus from spreading. We urge parents and caregivers to make immunizations a priority to protect their families and help protect our communities, too, by advancing public health goals.
