Two Michigan residents died from complications related to cyclospora, marking the first confirmed U.S. deaths from the microscopic parasite amid a nationwide outbreak that's infected more than 20,000 people, state health officials announced Monday.
Both victims had underlying health conditions that may have been worsened by the intestinal illness and resulting dehydration, according to the Michigan Department of Health and Human Services. The department declined to release additional details about the deaths.
The Outbreak's Scope
The CDC is tracking more than 18,000 confirmed or suspected cases in the current surge, though state reports suggest the actual number exceeds 20,000 nationwide. That's more than four times the previous record set seven years ago, when roughly 4,700 cases were reported in 2019.
Federal health investigators traced at least 1,947 cases to lettuce from Mexico served at Taco Bell locations across nine states. As of late July, that single contamination pathway had sent at least 98 people to hospitals. The CDC has warned that other "brands, restaurants, retailers, or distribution channels" could be tied to the outbreak as the investigation continues.
Cyclospora is a heat-loving parasite that infects the bowels and spreads through feces. People typically contract the illness by consuming fruits or vegetables exposed to feces-contaminated irrigation water. The parasite causes watery diarrhea "with frequent and sometimes explosive bowel movements," according to the Centers for Disease Control and Prevention.
Treatment and Risk Factors
Dr. Joel Kammeyer, division chief of infectious diseases at Wayne State University and the Detroit Medical Center, called the deaths a "tragedy" but emphasized the rarity of fatal outcomes. "For someone who comes into an urgent care and cyclosporiasis is their only issue, it's relatively easy to treat," Kammeyer said.
The danger escalates for patients already battling other illnesses. "It stands to reason that there are some patients that might not be able to withstand the dehydration that can come with severe cyclosporiasis," he said.
The CDC says cyclosporiasis is rarely deadly. Outbreaks tend to occur most often in late spring and summer.
Rising Case Numbers
Cyclosporiasis remains less common than other foodborne illnesses like salmonella and E. coli. Many cases are never linked to a specific food or source. For years, few U.S. cyclospora outbreaks were reported, but the number started climbing about a decade ago, with particularly notable spikes in 2018 and 2019.
Why This Matters:
The first U.S. deaths from cyclospora underscore ongoing food safety challenges in the international supply chain, particularly with produce imported from Mexico. With more than 20,000 Americans infected in this outbreak alone, the scale represents a significant public health and economic burden through medical costs, lost productivity, and business disruption. The CDC's acknowledgment that multiple distribution channels may be involved suggests the contamination problem extends beyond a single restaurant chain, raising questions about oversight of imported agricultural products and the adequacy of current food safety protocols. For consumers, the outbreak highlights the persistent risks in the modern food system where produce travels thousands of miles from farm to table, often crossing borders where regulatory standards and enforcement vary considerably from U.S. requirements.