The Idaho Department of Health and Welfare (DHW) is working with local and state partners to investigate a recent increase in illnesses after consumption of unpasteurized (raw) milk. Since May 19, 2026, nearly 60 people have been identified who became ill after consuming raw milk. At least 45 of those people tested positive for campylobacteriosis, a bacterial infection, although not everyone who is sick was tested. Investigation and interviews of people reported as ill are ongoing and additional illness may be identified. 

The Idaho Division of Public Health is collaborating with Panhandle District Health, Southwest District Health, Central District Health, Southeastern Idaho Public Health, South Central Public Health, and Eastern Idaho Public Health on the investigation.

Most people who were sick reported consuming raw milk from two different milking operations – one in northern Idaho and one in southern Idaho. 

Investigation is ongoing to identify potential batches of concern and test milk samples.

Raw, unpasteurized dairy products can contain bacteria that make people sick, particularly young children, pregnant women, the elderly, and those who are immunocompromised. Pasteurization kills nearly all the germs that can exist in raw milk while maintaining nutritional benefits. 

Common symptoms of campylobacteriosis infection include diarrhea (sometimes bloody), fever, stomach cramps, nausea and/or vomiting. Symptoms usually start two to five days after exposure and last about one week; some people may develop complications that last longer. Anyone who is experiencing symptoms after consuming raw milk or raw milk products is encouraged to promptly seek medical care.