Ontario has recorded 173 new measles cases in recent weeks, bringing the total to 350 since 2024, the highest number in over a decade.
Chief Medical Officer of Health Dr. Kieran Moore says more than 96 percent of cases involve individuals who are unvaccinated or have unknown immunization status, with a majority concentrated in southwestern Ontario.
Dr. Moore stresses that vaccination remains the best defense against the virus. “Measles is highly infectious and spreads quickly in communities,” he said. “But if you are vaccinated, your risk is very, very small.” The measles, mumps, and rubella (MMR) vaccine, which has been used in Ontario for 50 years, provides immunity rates in the high 90s and can offer lifelong protection after two doses.
Locally, Huron Perth Public Health advised residents of a potential measles exposure at Stratford General Hospital’s emergency room on March 9, 2025 between 11:30 a.m. and 2 p.m. Anyone born in 1970 or later who isn’t fully vaccinated should contact public health, as measles is highly contagious and can linger in the air for up to two hours.
Symptoms typically appear 7 to 21 days after exposure and include fever, cough, runny nose, red eyes, and a blotchy rash that spreads from the face down the body. Health officials stress that vaccination is the best defense, with two doses of the measles, mumps, and rubella (MMR) vaccine providing nearly complete protection.
“Because measles spreads through the air, it’s crucial that people call ahead to avoid exposing others in waiting rooms and emergency departments,” Dr. Moore emphasized. He also advised wearing a mask when visiting healthcare facilities if symptoms are present.
Anyone who believes they may have been exposed should stay home, avoid contact with others, and call their healthcare provider before seeking medical attention to prevent further spread. More information is available through Huron Perth Public Health.
