Tests on turtles or their environments in California and Illinois were positive for one of the two outbreak strains.
A shortage of oral cholera vaccine still complicates response efforts, with demand nearly double the number of doses produced since 2023.
Two states have now found Listeria in unopened liverwurst packages, and genetic sequencing shows a link to the outbreak.
Twenty-nine percent said they never use a thermometer to check food temperatures.
Liverwurst is the main suspect, but investigators are examining if other deli meats are involved in the outbreak.
Michigan's outbreak in dairy cows is its second of the month and is the first in Van Buren County.
Sixteen of 18 people sickened (89%) reported eating meats sliced at deli counters (not packaged meats).
Of backyard flock samples, 22% tested positive for Campylobacter, compared with 12% of the farm samples, and many were antibiotic-resistant.
Raw Farm (formerly Organic Pastures) of Fresno, California, has been linked to the outbreak.
The incidence of domestically acquired campylobacteriosis, pathogenic E coli infection, yersiniosis, vibriosis, and cyclosporiasis increased.
