From CDC: Source of the Outbreak
Information collected so far shows that deli meat and cheese purchased at deli counters in multiple states are the likely sources of this outbreak.
It is difficult for investigators to identify a single food as the source of outbreaks linked to deli meats and cheeses. This is because Listeria spreads easily between food and the deli environment and can persist for a long time in deli display cases and on equipment. A contaminated food likely introduced the outbreak strain of Listeria into delis in multiple states. Investigators are working to identify any specific products or delis that may be contaminated with the outbreak strain.
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