A nationwide health alert has been issued concerning potential listeria contamination found in selected frozen meals from Trader Joe’s and Walmart. The USDA has linked multiple pasta and meatball products to a deadly listeria outbreak, prompting recalls and public warnings. The CDC has expanded its investigation, reporting numerous cases of listeria illnesses associated with these products, leading to at least four deaths. Consumers are urged to check their refrigerators and return any affected items to stores. Health officials continue to investigate the outbreak, with more recalls expected as the situation develops.