It is now the largest listeriosis outbreak in the US since the 2011 outbreak linked to cantaloupe.
Two states have now found Listeria in unopened liverwurst packages, and genetic sequencing shows a link to the outbreak.
Liverwurst is the main suspect, but investigators are examining if other deli meats are involved in the outbreak.
All measles cases occurred in unvaccinated children.
Sixteen of 18 people sickened (89%) reported eating meats sliced at deli counters (not packaged meats).
The incidence of domestically acquired campylobacteriosis, pathogenic E coli infection, yersiniosis, vibriosis, and cyclosporiasis increased.
The illnesses were caused by Campylobacter, Salmonella, E coli, or Listeria monocytogenes.
As small clusters continue, the CDC notes that only 1 in 4 eligible people have received both mpox vaccine doses.
The CDC investigated the outbreak in 2017 and 2021, but didn't have enough details to identify a specific cheese brand.
So far at least 11 people in seven states have been sickened with Listeria monocytogenes, which can cause severe and fatal infections.
