Federal health officials have issued a warning related to some packaged pasta meals after 20 people have been infected with an outbreak strain of Listeria across 15 states. The situation has resulted in four deaths and a fetal loss, and while no Colorado cases have been reported at this time, a related death did occur in neighboring Utah.

Impacted pasta meals are some of those produced by FreshRealm Inc., which are sold under Marketside and Home Chef brands. Ill people are reported to have purchased the products from the refrigerated section at Walmart and Kroger, though the situation could involve meals from the aforementioned brands sold elsewhere, as well.

Three dishes that the CDC highlights in their report include the Marketside Grilled Chicken Alfredo with Fettuccine, the Marketside Linguine with Beef Meatballs and Marinara Sauce, and the Home Chef Chicken Fettuccine Alfredo.

“Do not eat these meals and return them or throw them out,” reads a press release from the CDC about the situation.

Based on a timeline from the CDC, people started getting sick in August of 2024, with cases continuing to pop up over the last year. While the CDC notes that 20 cases have been reported, the agency also notes that it’s likely the true number of cases is higher as some people recover without the need for medical care, thus are not tested.

Listeria infection is caused by a bacteria that’s spread through food with that bacteria capable of surviving refrigeration and freezing. Pregnant women, people over 65, and people with weakened immune systems tend to be most at-risk. Some of the more mild symptoms include loose stools and an upset stomach, with more serious symptoms including seizures, confusion, and flu-like symptoms.

Read more about listeria here and see the press release from the CDC here.