ALLENTOWN — Health officials say a dozen Pennsylvania residents, including some in Butler County, have been infected in a salmonella outbreak that has reached 42 states.

The Centers for Disease Control and Prevention says close to 400 people have been infected with the bacterial illness. No deaths have been reported.

Officials say the infected Pennsylvanians are in Bucks, Butler, Chester, Clinton, Delaware, Philadelphia, Lancaster, Lehigh, Luzerne, and Montgomery counties. Their ages range from three to 73 years.

Health officials in Minnesota say lab tests traced the salmonella bacteria to a container of peanut butter. They are waiting for more test results.

Most people with salmonella recover on their own, although some may need fluids to prevent dehydration. In other cases, patients need antibiotics.