Four dead, 32 sickened in listeria outbreak tied to mushrooms from Korea

Listeria is particularly risky for the elderly and pregnant women. Two women have reported miscarriages caused by the contaminated enoki mushrooms.

The CDC and FDA recommended Tuesday that all high-risk groups avoid eating any enoki mushrooms from Korea. They also advised that everyone avoid eating enoki mushrooms if they don't know where they came from.

And restaurants and homes that had the recalled mushrooms in their fridges should thoroughly wash any surfaces they touched, as "listeria can survive in refrigerated temperatures and can easily spread to other foods and surfaces," the CDC said.