Idaho health officials are investigating how nearly 60 people got sick after drinking raw milk in the past two weeks.

The Idaho Department of Health and Welfare announced in a news release on Wednesday that most of the people reported being sick after drinking raw milk from two different milking operations in North Idaho and southern Idaho. The infections were reported starting May 19.

The state health agency didn’t disclose the names of the dairies, but said they are collaborating with health officials “to identify and fix any potential sources of contamination.”