A parasitic infection linked to gastrointestinal issues has reportedly affected over a dozen states in the United States, with health officials attributing the outbreak to tainted lettuce.

The Cyclospora parasite is known to induce symptoms such as diarrhea, nausea, and occasionally vomiting, with untreated cases potentially persisting for more than a month.

The Centers for Disease Control and Prevention (CDC) has confirmed the outbreak’s connection to nine states, though local news sources, including The Washington Post, anticipate that this number may rise to at least 15.

Michigan has reported at least two fatalities, marking the first deaths associated with this outbreak.

Understanding Cyclospora

Cyclosporiasis is an intestinal illness that can be contracted through the consumption of raw fruits and vegetables or water contaminated with the Cyclospora parasite. Transmission occurs primarily through fecal matter.

Professor Shokoofeh Shamsi, a parasitologist at Charles Sturt University, noted that the parasite can easily infiltrate various aspects of daily life, leading to infection. While the illness is rarely fatal, it poses a greater risk to children, the elderly, and those with weakened immune systems.

Dr. Enzo Palombo, a food microbiologist at Swinburne University, has provided guidance on proper food handling, storage, and preparation to mitigate the risks associated with consuming contaminated leftovers.

According to Michigan health officials, both individuals who died had pre-existing health conditions that may have exacerbated their infections and dehydration.

“Complacency is a precursor for outbreaks,” warned Professor Shamsi, adding, “The United States, despite being a leader in global health, is struggling to manage this situation. These two deaths are likely just the beginning; there are likely many more cases that remain unreported.”

Origin of the Cyclospora Outbreak

The Food and Drug Administration (FDA) has traced the outbreak to iceberg lettuce sourced from central Mexico. The lettuce, supplied by Taylor Farms de Mexico, was distributed to various Taco Bell locations across multiple states.

In response to the outbreak, Taylor Farms has initiated a recall of the affected lettuce products, which were distributed to 27 states between June 29 and July 16. This supplier was also involved in a significant Cyclospora outbreak in 2013 that affected numerous states.

The FDA and CDC are currently investigating reported cases and contaminated products, anticipating that confirmed case numbers will continue to rise despite the recall.

Former FDA Commissioner Scott Gottlieb noted that adverse weather conditions may have increased the likelihood of contamination, suggesting that raw sewage might have contaminated agricultural areas due to flooding or other incidents.

“There was an event in central Mexico that likely led to widespread contamination of fields,” he stated during a CNBC interview.

In Mexico, analysts are awaiting the results of official investigations, which have so far revealed only a handful of cases related to the outbreak.

While most cases are connected to Taylor Farms, at least two additional outbreaks with undetermined sources are under investigation.

Democratic Congressman Josh Gottheimer attributed the outbreak’s severity to budget cuts at the FDA and CDC during the second Trump administration, claiming that over 70 percent of the CDC team responsible for monitoring Cyclospora and similar parasites has been dismissed since 2025.

Current Case Statistics

As of August 3, the CDC reported 10,468 confirmed cases of cyclosporiasis, with an additional 12,255 cases pending confirmation. Health officials believe these figures represent only a small portion of the actual outbreak, as cases are likely underreported.

A total of 47 states have documented cases, and at least 517 individuals have been hospitalized. Dr. Gottlieb expressed concern that the actual count could be 10 to 20 times higher than reported, describing this outbreak as the largest in Cyclospora’s history.

In Michigan, the state most affected, officials have recorded 11,508 total cases, significantly exceeding the CDC’s confirmed count. The CDC does not include probable cases in its totals, leading to discrepancies based on how states categorize their data.

Dr. Natasha Bagdasarian, Michigan’s chief medical executive, mentioned that local health departments are actively interviewing patients about their food consumption patterns, with this information being compiled into a statewide database.

“We need to trace back the source of the contamination, from the point of produce consumption all the way to its origin,” Dr. Bagdasarian explained.

Preventing the Spread of Cyclospora

According to Professor Shamsi, Cyclospora is particularly resilient and challenging to eliminate. “The only reliable method for killing it is through high temperatures achieved during proper cooking,” she noted.

To prevent cyclosporiasis, the following guidelines are recommended:

• Wash hands thoroughly with soap and water before and after handling raw fruits and vegetables.
• Rinse all produce before consumption, cutting, or cooking.
• Cook produce to a minimum temperature of 70 degrees Celsius.

However, given the popularity of salads and raw vegetables, which health professionals advocate consuming regularly, proper food safety measures are essential. It is not solely the public’s responsibility to stay informed; policymakers and food safety sectors must implement robust supply chain systems focused on prevention. If contamination occurs, vigilant monitoring and removal of affected products from the market are crucial.

As of now, there have been no further outbreaks reported.