Three people have been sickened with the same strain of E. coli O157:H7 in Wisconsin, and officials suspect that raw milk may be to blame.

According to Food Safety News, a three-year-old is among the sick.

Officials are investigating the illnesses and testing raw milk samples from a suspected dairy.

“Raw milk was the most likely commonality we’ve been able to identify,” Wisconsin Department of Agriculture spokeswoman Raechelle Cline told Food Safety News.

Read more here.

Raw milk has been linked to several disease outbreaks across the country. This week, raw milk cheese was responsible for sickening 13 people in Minnesota. In March, 24 people in Alaska fell ill in a campylobacter outbreak linked to raw milk. Washington officials urged consumers in February to stop drinking raw milk after tests confirmed E. coli in raw milk from a local dairy.