A salmonella Heidelberg outbreak sickened 21 people this year, landing eight of them in the hospital, according to the U.S. Centers for Disease Control and Prevention. The strain of salmonella identified in the outbreak shows signs of multidrug-resistance, making the infections riskier than normal for people who get them. Dairy bull calves from Wisconsin are the suspected culprit. The calves in question are raised for meat but were also purchased for projects for 4-H, a nationwide youth-focused program that involves children and young adults in hands-on agricultural work. The outbreak spanned eight states ― California, Iowa, Idaho, Minnesota, Missouri, Oklahoma, South Dakota and Wisconsin ― between January and October. This is the seventh Salmonella outbreak in 2016. Previous CDC investigations this year have identified sprouts, nuts, poultry, egg shells and milkshake mixes as sources for past Salmonella outbreaks.