The Centers for Disease Control and Prevention are looking into two separate Listeria outbreaks linked to packaged salads.

Dole Fresh Vegetables and Fresh Express have voluntarily recalled packaged salad products due to contamination with Listeria monocytogenes.

Products include mixed greens, garden salads, Caesar kits, and other types of salads in bags and clamshells.

Dole’s recall pertains to products with “Best if used by” dates from Nov. 30, 2021, through Jan. 8, 2022, and a lot code that begins with the letter “N” or “Y” in the upper right-hand corner of the packaging.

The Fresh Express recall includes all “Use-By” dates with product codes Z324 through Z350.

The U.S. Food and Drug Administration issued a statement noting that Listeria infection can cause serious and sometimes fatal infections.

“Although healthy individuals may suffer only short-term symptoms such as high fever, severe headache, stiffness, nausea, abdominal pain, and diarrhea, Listeria infection can cause miscarriages and stillbirths among pregnant women,” the statement said.

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The FDA statement urged people to discard any salad packages that are included in the recall.