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The Ontario health ministry warned Monday that 1,300 people were potentially exposed to measles at a two-day Christian youth event in Toronto.

The public advisory said a measles patient was infectious while attending the Acquire the Fire event on Feb. 6 and 7 in Toronto — billed as a weekend that “changes your teen’s life forever.”

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Acting chief medical officer of health Robin Williams called it a “pretty intense exposure” — since the teens were mixing together for a total of 27 hours over the course of the weekend.

“It’s the largest exposure we know of at this point in the outbreak,” she said.

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But Dr. Williams stressed that the development was in no way a public health emergency, noting that 98% of Ontario teens are immunized with two doses of the measles vaccine.

The health ministry called on all unvaccinated attendees to immediately isolate themselves and call their public health unit.

Dr. Williams urged those attendees to call ahead before making any visits to a health care provider.