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April Hexemer, director of the outbreak management division at the Public Health Agency of Canada, said for every case that is lab confirmed there are an estimated 32 more undetected in the community.聽

"We estimate that there's several hundred illnesses associated with this outbreak at this time," she said.聽

Hexemer said it is crucial to understand that frozen food can contain ingredients contaminated with bacteria, and that it's up to the consumer to follow the cooking instructions.聽

FREEZING AND HEATING

Lawrence Goodridge, a professor and Canada Research Chair in foodborne pathogen dynamics at the University of Guelph, said freezers stop the growth of bacteria, but they don鈥檛 kill it.聽

That means if the product got cross-contaminated or there was a sanitation failure when it was made, the freezer would actually preserve the bacteria.聽

The cooking instructions on the pizza pop package say a consumer can cook the product in a microwave, oven or air fryer.聽

For microwaving, it says to heat it for one minute on High, flip it, and then put it in for another minute.

Jennifer Ronholm, an associate professor at McGill University and a Canada Research Chair in agricultural microbiology, said the challenge with microwaves is they are prone to producing food with hot and cold spots. They also vary widely and their power weakens over time, which means putting a Pizza Pop in on High for one minute is different for each person.聽

Ronholm said the internal temperature needs to get to 71 degrees Celsius, which is too hot to bite into.聽

"I have a feeling that a pizza pocket isn't something people usually check with a temperature probe" Ronholm said.聽

Ronholm says it鈥檚 important not to cook for other people for about 20 days after consuming the contaminated product. 鈥淓ven if you're not sick, you still could be a carrier of the infection and still be able to pass it on to your family,鈥� she said.聽

E. coli symptoms can include nausea, vomiting, headache, mild fever, severe stomach cramps, and watery or bloody diarrhea.

Most people will fully recover after a few days without treatment, but people who are pregnant, under the age of five, over the age of 60, or have weakened immune systems, are at a higher risk of severe illness.聽

This report by 好色tvwas first published Dec. 23, 2025.聽

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