McDonald’s Corp. shares dipped in the extended session Thursday after the Iowa Department of Public Health announced that it was investigating “an increase in Cyclospora infections that appear to be connected to consumption of McDonald’s salads.” The department said that it had identified 15 people in that state who had become ill with such an infection after eating McDonald’s salads in late June and early July. In a separate announcement, Illinois public health officials said it had confirmed 90 cases of cyclosporiasis. “Anyone who ate these salads since the middle of June and who developed diarrhea, especially watery diarrhea and fatigue, should see their health care provider and get tested for Cyclospora to ensure an accurate diagnosis and appropriate treatment,” Dr. Patricia Quinlisk said in the announcement. Cyclospora is a parasite more common in developing countries, but it has been tracked in the U.S., especially in the summer months, the health department noted. McDonald’s did not immediately respond to a request for comment, but the Iowa Department of Public Health said the fast-food chain “is concerned about this situation and has been fully cooperating.” McDonald’s stock dropped 1.2% in after-hours action Thursday, after closing with a 0.3% gain at $159.12. Shares have declined 7.6% so far this year, while the S&P 500 index has gained 4.7%
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