York Region Public Health is confirming a new case of measles in Thornhill that’s linked to an ongoing outbreak.

It’s now the fifth confirmed case connected to the outbreak that was declared on September 4, 2025.

York public health says you may have been exposed to the virus if you attended the following locations at the listed times:

Anyone who thinks they may have been exposed should do the following: • Immediately confirm they have two doses of the measles vaccine • Call York Region Public Health immediately if you were present AND you are pregnant, are with an infant under 12 months of age or are immunocompromised, because you may be eligible for treatment to prevent measles infection • Visit york.ca/MeaslesReporting to complete a brief contact follow-up survey; this will help

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