Do not rely on smell or appearance to determine whether the product is safe, Thousands of tomato bisque soup kits sold at select Walmart stores in almost 30 states have been recalled over concerns the products may be contaminated with Listeria. The harmful bacteria is generally spread when food comes in contact with contaminated surfaces during manufacturing or storage, per the FDA. The agencynotesthat the listeriosis-causing bacteria can lead to serious and potentially fatal infections in young children, older adults, and those with weakened immune systems. Other symptoms of mild listeriosis may include muscle aches or vomiting, while severe cases may result in confusion, loss of balance, and convulsions, the FDA said.