"So, we've been working with McDonald's and some of the other states that have seen cases to try and determine what exactly is going on", said Quinlisk.
Cyclospora cayetanensis is a parasite that can contaminate food and water through feces.
McDonald's is stopping the sale of salads at 3,000 restaurants after people became sick from a parasite causing intestinal illness.
McDonald's said it had voluntarily stopped selling salads at 3,000 of its USA restaurants, most of which are in the Midwest, until it could switch to another lettuce blend supplier.
Symptoms typically appear about a week after the initial infection, according to the CDC.
Food and Drug Administration Commissioner Scott Gottlieb said Friday on Twitter that there were 15 new cases connected to the Del Monte vegetable trays. Del Monte recalled the trays in early June, the FDA says, and the agency says the Del Monte outbreak is not related to the one involving McDonald's. Health officials are warning anyone who ate a McDonald's salad recently and has symptoms to get tested for the illness.
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Cases of people infected by the Cyclospora parasite, believed to have originated from ingesting lettuce in McDonald's salads, have spread to another four states-Wisconsin, Nebraska, South Dakota, and Minnesota.
Health officials in IL and Iowa say they've identified roughly 100 combined cases of cyclosporiasis apparently linked to consuming McDonald's salads.
"This summer there have been several clusters of Cyclospora illness associated with various foods that are commercially available".
The most common symptom is watery diarrhea.
Earlier this week, the IL and Iowa health departments said they were investigating outbreaks of a parasite that causes intestinal illness and might be linked to McDonald's salads. Patients can be treated with antibiotics.