Listeria Outbreak 2024 States Affected. As of july 26, 2024, a total of 34 people infected with the outbreak strain of listeria have been reported from 13 states (see map). By the end of the month, it was believed that the outbreak was linked to a boar’s head.

At least 13 people have been admitted to hospital. A listeria outbreak linked to sliced deli meat has killed two people and hospitalized 28.