The North Dakota Department of Health (NDDoH) is investigating an increase in reported cases of salmonellosis, an infection caused by Salmonella bacteria. The illness can cause diarrhea, abdominal cramping, nausea, vomiting and fever. Since July 20, 22 cases of a particular strain of Salmonella (Salmonella Thompson) have been reported.

Because the infections all have the same genetic pattern, they may have all originated from a common source. However, so far the investigation has not revealed a common food item, place or event where all of the cases may have been exposed. “Illness may be more severe in very young children, older individuals and those with underlying health problems or reduced immunity. People who experience symptoms consistent with a Salmonella infection should consider consulting with their health care provider,” according to Laura Cronquist, an epidemiologist with the Division of Disease Control.

The investigation of the outbreak has been challenging. Of the 22 cases, 14 have been from Ward County. The cases who were not from Ward County reported travel to that area. According to Cronquist, “These investigations can be very complex when there is no obvious common exposure. One of the challenges is getting good histories from people. People can forget what or when they consume specific foods or drinks.” Cronquist added that if patients refer to electronic or paper calendars, checkbooks, online account statements, restaurant receipts or grocery store receipts, it may help them remember what they ate or drank.

To assist in the investigation, NDDoH will be collecting information from randomly-contacted people who have not been ill and will compare that information to data that has been collected from people who were ill. This may help narrow down the cause of the infection. The NDDoH is working with the public health programs at the University of North Dakota and North Dakota State University to gather this information.