The numbers are limited so far, according to health officials, who say each state has two cases, with the exception of Minnesota, which has three, reported USA Today.
(Undated) - Health officials across the Midwest are investigating a Cyclospora outbreak that appears to be connected to McDonald's. Health officials are warning anyone who ate a McDonald's salad recently and has symptoms to get tested for the illness.
Illinois' health department said Thursday that it confirmed about 90 cases of cyclosporiasis since mid-May. According to the Wall Street Journal, one-fourth of the 90 cases of cyclosporiasis reported in IL have been linked to McDonald's salads, while 15 cases have been linked to the salads in Iowa.
In an email, McDonald's said it's working with officials in the affected states.
People become sick with cyclosporiasis after eating food or drinking water carrying the parasite, according to the Centers for Disease Control and Prevention. Other symptoms include loss of appetite, weight loss, stomach pain, and fatigue.
In some cases, people may also experience fever and vomiting, it said.
Since mid-May, Illinois alone has seen more than 100 cases of cyclosporiasis, an intestinal illness caused by the parasite cyclospora, according to an announcement from the Illinois Department of Public Health.
"Out of an abundance of caution, we made a decision to voluntarily stop selling salads at impacted restaurants until we can switch to another lettuce blend supplier", the email said.
McDonald's said Friday it's voluntarily pulling salads from about 3,000 locations in 14 states, primarily in the Midwest, until it can switch to a different lettuce supplier.