A listeria outbreak linked to ready-to-eat pasta meals sold at popular grocery stores around the country has grown, with three more illness reported and one additional death.

The U.S. Centers for Disease Control and Prevention shared in a Sept. 26 update that the outbreak has now led to 20 reported illnesses, 19 hospitalizations and four deaths in 15 states.

The source of the outbreak has not been confirmed and the investigation is ongoing.

However, preliminary testing has linked beef meatball marinara linguine meals sold under the brand Marketside, and chicken fettuccine alfredo meals sold under the brands Marketside, Home Chef and Trader Joe's, as possibly linked to the outbreak. These products were available at Walmart, Kroger and Trader Joe's stores nationwide.

The outbreak was f

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