Michigan Passes 10,000 Cyclosporiasis Cases—And Experts Still Don’t Have A Definitive Cause Mary Roeloffs is a Forbes breaking news reporter covering pop culture.Jul 29, 2026, 11:26am EDTToplineHealth officials in Michigan on Wednesday said more than 10,000 people in the state are thought to have been infected with cyclosporiasis amid an outbreak that continues to evade investigators who have identified one likely source of the infection—but aren’t sure where else it’s coming from. Workers wash and pack romaine lettuce.UCG/Universal Images Group via Getty ImagesKey FactsMichigan's Health and Human Services department said it can now count 10,077 cases of cyclosporiasis with 160 people hospitalized, making up a majority of the more than 11,500 cases reported across 41 states in the last two months. This is a developing story and will be updated. LOADING VIDEO PLAYER...FORBES’ FEATURED Video
Michigan Passes 10,000 Cyclosporiasis Cases—As Officials Continue Tracing Source Of Outbreak
Total case numbers have surpassed 11,500 reported cases across 41 states—but Michigan has by far been the hardest hit.
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