Salmonella Heidelberg

Salmonella bacteria can be found everywhere in the environment. Every year, the bacteria cause nearly one million foodborne illnesses nationwide. In Wisconsin, Salmonella is a common cause of gastrointestinal illness and is reportable. Certain strains can be more harmful than others. The Wisconsin Department of Health Services (DHS) is assisting in investigating an outbreak of multidrug resistant (MDR) Salmonella Heidelberg infections believed to have come from contact with dairy bull calves.


  • Nationwide, 54 people from 15 states have been infected with the outbreak strain of Salmonella Heidelberg.
  • Illnesses have occurred from January 27, 2015, to October 15, 2017. Seventeen people were hospitalized, and no deaths have been reported.
  • Contact with dairy calves or cattle has been reported by 63% of ill persons.
  • See CDC Salmonella Heidelberg website for complete outbreak details.
Wisconsin Salmonella Heidelberg Case Count 2015-2017
Updated November 28, 2017
Wisconsin Case Count 18
National Case Count (including Wisconsin cases) 54



Last Revised: August 2, 2021