The salmonella outbreak affecting 15 U.S. states has puzzled investigators.

The U.S. Centers for Disease Control and Prevention (CDC) is investigating a salmonella outbreak that currently affects 15 states,media BGR reported. The first salmonella infection was reported in July, and 125 people have been sicksince. The CDC has not traced the source of the infection to specific food, supermarket or restaurant chains.

The salmonella outbreak affecting 15 U.S. states has puzzled investigators.

The CDC this week announced a new investigation into potential salmonella outbreaks in several states. The CDC says the first outbreak occurred two weeks ago and involved 13 reports of individual illnesses. Since then, the outbreak has sickened 125 people and required hospital treatment for 24. It is worth noting that no deaths have been reported. Currently, potential salmonella infections have been reported in as many as 15 states.

The CDC investigation is ongoing and it is still unclear what the source of the infection was. Although salmonella outbreaks often can be traced back to specific foods, restaurants or supermarkets, the CDC investigation has so far produced no concrete evidence in any direction. In the meantime, the CDC is still actively interviewing sick individuals to determine the source of the exposure.

Geographically, there have been cases of infection across the United States. To date, the CDC has confirmed salmonella infections in California, Illinois, Iowa, Michigan, Minnesota, Missouri, Montana, North Carolina, Ohio, Oregon, Tennessee, Utah, Washington, Wisconsin, and Wyoming. To date, the worst-affected states include Oregon (where 42 infections have occurred), Utah (28 infections) and Michigan (12 infections).

According to the CDC, the list of salmonella symptoms is as follows:

Most people infected with salmonella develop symptoms such as diarrhea, fever, stomach cramps, within 6 hours to 6 days of exposure to the bacteria.

The condition usually lasts 4 to 7 days and most people recover without treatment.

Some people may be very ill and require hospital treatment. Salmonella infections can spread from the intestines to the blood stream and then to other parts of the body.

Children under 5 years of age, adults 65 and older, and people with weakened immune systems are more likely to develop serious illnesses.

If people think they may have these symptoms, the CDC recommends the following:

Consult your healthcare provider.

Write down what you ate in the week before you started getting sick.

Report your illness to the health department.

Assist public health investigators and answer questions about your illness.