The U.S. is facing a rapidly expanding cyclosporiasis outbreak, with confirmed cases surpassing 4,173 across 41 states and 308 hospitalizations. The CDC estimates more than 7,400 additional probable cases may exist. At least 1,644 illnesses have been linked to shredded iceberg lettuce from central Mexico distributed by Taylor Farms, though multiple sources are suspected. Tracing Cyclospora is challenging and requires time-consuming interviews and supply-chain reviews.
Cyclosporiasis Outbreak More Than Doubles: 4,173+ Confirmed Cases Across 41 States
Salad greens for sale at a bodega in Astoria, New York. The number of cases of cyclosporiasis has more than doubled to over 4,173 cases across 41 states this week. (Photo by Shalina Chatlani/ Stateline)
The number of confirmed cyclosporiasis infections — a parasitic illness tied to contaminated food or water that causes severe intestinal symptoms — has more than doubled this week to more than 4,173 cases spanning 41 states, the U.S. Centers for Disease Control and Prevention (CDC) reports.
Patients commonly experience watery or particularly intense diarrhea, nausea and abdominal cramps. Although no deaths have been reported, hospitalizations have risen sharply to 308, up from 141 the prior week. The CDC also estimates there may be more than 7,400 additional probable cases that have not yet been confirmed.
Investigators believe the outbreak has multiple sources, but public health officials have linked at least 1,644 illnesses in Indiana, Kentucky, Michigan, Ohio and West Virginia to shredded iceberg lettuce grown in central Mexico and distributed by Taylor Farms. Health agencies caution, however, that additional sources remain under investigation.
The complexity of Cyclospora's genome makes genomic tracing less effective than for many bacterial foodborne pathogens. As a result, state and local investigators often rely on time-consuming case interviews and careful review of restaurant receipts, grocery records, menus and supply-chain documentation to identify connections between illnesses.
"Case interviews and traceback investigations are often time intensive, creating a burden on state and local public health infrastructure," wrote senior analyst Heather Tomlinson and environmental health director Courtney Anderson of the Association of State and Territorial Health Officials.
As of July 20, North Carolina had confirmed more than 560 cases. State officials said they are leaning on local health departments and regular coordination calls with the CDC to keep up with the investigation and patient follow-up.
Public guidance: People with persistent or severe diarrhea, especially after eating fresh produce or dining out, should seek medical attention — doctors can test for Cyclospora and prescribe treatment when appropriate. Practicing careful hand hygiene and following public health guidance on produce consumption can help reduce risk.
(Photo and reporting by Shalina Chatlani/Stateline.)
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