Bagged salad may be to blame in reports of a stomach bug that has sickened hundreds of people throughout the Midwest.

Busy people often turned to bagged salad...but it may be behind a stomach bug outbreak called cyclosporiasis. The cyclosporiasis outbreak has been occurring since June, and health officials are increasingly concerned.

Now, however, they have found a possible culprit. Health officials in Iowa and Nebraska said Tuesday that prepackaged salad mix may be the source of the stomach bug outbreak in both states.

Cyclosporiasis has broken out throughout the U.S., but particularly in those states and Texas. Iowa has 140 cases of cyclospora infection; Texas 101; Nebraska 78.

The brand and manufacturer of the bagged salad that is to blame has not yet been identified.

"The evidence points to a salad mix containing iceberg and romaine lettuce, as well as carrots and red cabbage as the source of the outbreak reported in Iowa and Nebraska," Steven Mandernach, chief of the Food and Consumer Safety Bureau of the Iowa Department of Inspections and Appeals, told press.

Around 80% of Iowa's reported cyclosporia cases had the same bagged salad mix, according to the  Iowa Department of Public Health. However, they added that the salad mix to blame isn't in Iowa's food supply chain anymore.

Bagged salad may not be the sole cause of the outbreak-the investigation is ongoing.

"FDA will continue to work with its federal, state and local partners in the investigation to determine whether this conclusion applies to the increased number of cases of cyclosporiasis in other states," the FDA said. "The goal will be to combine information collected from other affected states with that provided by the state health authorities in Iowa to identify a specific food item linked to the illnesses."

There have been a total of 370 cases in 16 states, and 21 people or more have been hospitalized.

The stomach bug is caused by cyclospora, which is usually ingested via contaminated food or drinking water.

Cyclospora infection symptoms include diarrhea, cramping, bloating, nausea and fatigue, and can last for weeks or even months if left untreated.