Tons of different treats will be available and handed out this Halloween. Before you accept certain ones, there is something you need to know.

According to Popular Science, one of the beloved favorites of Halloween trick or treating, can actually poison you. Caramel Apples.

Last year 34 people were hospitalized according to mbio. The cause? Listeria monocytogenes, this is a bacteria that can cause you to become very ill. Some symptoms include fever, headache, and vomiting.

It is imperative that if you are going to treat your guests that the Caramel Apples must be cold, to keep this bacteria from forming. It is recommended to eat them while they are cold. If they are room temperature, the advice is to simply throw the Caramel Apple away, or simply eat a fresh apple instead.

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