WISCONSIN (CBS 58) -- A CDC update to a multi-state outbreak of drug-resistant Salmonella Heidelberg infections linked to contact with dairy calves has revealed that Wisconsin was the hardest hit.

56 people were infected with outbreak from 15 states. 17 people were hospitalized and no deaths were reported.

The Midwest was hardest hit with Wisconsin seeing 18 cases. Missouri, Minnesota and South Dakota had seven, six and five cases respectively.

Iowa, Indiana, Ohio, Kentucky, North Dakota, Virginia, New Jersey, Oklahoma, Texas, California and Idaho were also impacted.

The CDC says that more illnesses could happen if people don't take precautions when working with dairy calves and other cattle.