Story highlights The source of the raw chicken is unclear, and no single common supplier has been identified

The strain is resistant to multiple antibiotics

(CNN) At least 92 people in 29 states have been infected with a strain of multidrug-resistant salmonella after coming into contact with a variety of raw chicken products, the US Centers for Disease Control and Prevention said Wednesday. Twenty-one of the sick patients have been hospitalized, though no deaths have been reported.

The source of the raw chicken is unclear from lab tests, and no single common supplier has been identified. The strain has shown up in samples from a variety of raw chicken products including pet food, chicken pieces, ground pieces and whole chickens. The bacteria have also been found in live chickens. The US Department of Agriculture's Food Safety and Inspection Service is monitoring the outbreak, and the CDC's investigation is ongoing.

This particular salmonella strain is resistant to multiple antibiotics , the most common form of treatment.

People sick with this strain have experienced stomach pain, cramps, diarrhea and fever 12 to 72 hours after exposure to the bacteria.

Most people infected with salmonella, the most frequent cause of foodborne illness, get better in four to seven days without treatment. Symptoms can be worse for people with underlying medical conditions, children under 5 and people older than 65, as they typically have weaker immune systems.