The Iowa Department of Public Health (IDPH) on Thursday said it was investigating a rise in Cyclospora infections, likely due to the consumption of a salad served by McDonald’s Corp.
Symptoms of Cyclospora, a parasite common during the summer months, include frequent watery diarrhea, loss of appetite and weight, and nausea.
Shares of McDonald’s were down 1.4 percent in after-hours trading.
McDonald’s did not immediately respond to a request for comment.
Reporting by Nivedita Balu in Bengaluru; Editing by Maju Samuel