The Food and Drug Administration (FDA) announced on Wednesday that it is investigating yet another outbreak of Cyclospora, a unicellular foodborne parasite that causes explosive, watery diarrhea. The agency reported 72 cases in this new cluster, but has not identified the source. This marks the sixth Cyclospora outbreak investigation the FDA has opened this year, as the Centers for Disease Control and Prevention (CDC) has recorded more than 11,500 cases—including 4,173 confirmed and over 7,400 probable—across 41 states. Among those, 308 hospitalizations have been reported, but no deaths.

The scale of this year's outbreak is unprecedented. In recent years, the U.S. has typically seen between 2,000 and 5,000 cases annually, according to CDC data. The current tally, already exceeding 11,500, is likely to climb as new cases are identified. Despite the surge, Health Secretary Robert F. Kennedy Jr. stated earlier this week that the situation is "under control," a comment that has drawn criticism from public health experts.

The Outbreak: A Rapidly Spreading Parasite

Cyclospora cayetanensis is a microscopic parasite that infects the small intestine, causing symptoms such as watery diarrhea (often described as explosive), loss of appetite, weight loss, stomach cramps, bloating, increased gas, nausea, and fatigue. Symptoms typically appear about a week after consuming contaminated food or water and can last from a few days to several months if untreated. The parasite is commonly linked to fresh produce, particularly imported berries, basil, and leafy greens.

In this year's outbreaks, the FDA has been investigating multiple potential sources. Earlier this year, the agency linked a large outbreak to Taylor Farms brand iceberg lettuce, which was supplied to restaurants like Taco Bell and Sweetgreen. However, on July 10, the FDA reversed its initial finding, stating that testing had not confirmed the lettuce as the source—a mistake that has caused confusion and frustration among consumers and industry stakeholders. "The FDA made a big reversal in its cyclosporiasis probe, but it still thinks iceberg lettuce is to blame," reported one outlet. Another source noted, "FDA Admits Major Error In Cyclospora Outbreak Investigation… But It May Still Be Right."

The new outbreak of 72 cases is not linked to lettuce, according to the FDA, but the agency has not yet identified the contaminated product. This has led to widespread speculation and concern. "New outbreak of explosive diarrhea parasite reported by FDA — with 72 cases and no known source," headlined the New York Post. People magazine echoed the uncertainty: "New Cyclospora Outbreak Is Being Investigated By the FDA, and the Source Has Yet to Be Discovered."

Conflicting Reports and Legal Repercussions

While the FDA investigates, lawsuits have already been filed against Taco Bell, alleging that contaminated lettuce served at the chain caused illnesses. "Taco Bell faces first lawsuits over diarrhea-causing contaminated lettuce," reported the New York Post. The lawsuits claim that the chain served Cyclospora-tainted lettuce from Taylor Farms, despite the FDA's retraction. This legal action adds pressure on both the restaurant industry and regulators to improve food safety protocols.

Meanwhile, some outlets have reported that the potential source of the outbreak has been identified but does not tell the whole story. "Potential Source of Explosive Diarrhea Outbreak Identified — but It Doesn't Tell the Whole Story," noted an MSN article. The FDA continues to investigate multiple clusters, with some linked to specific products and others still mysterious. "Another cyclosporiasis outbreak investigated as cases of diarrhea-causing illness continue to mount," reported another source.

Public Health Response and Prevention

The CDC has issued guidance for consumers to reduce the risk of Cyclospora infection. Recommendations include washing fresh produce thoroughly, cooking food to safe temperatures, and avoiding untreated water. The agency also advises that travelers to tropical and subtropical regions take extra precautions, as Cyclospora is more common in those areas.

Despite the FDA's misstep in the lettuce investigation, the agency maintains that Taylor Farms is still the most likely source of the larger outbreak. "Taylor Farms still most likely source of cyclospora outbreak, FDA says," reported USA Today. However, the new 72-case outbreak is unrelated, underscoring the complexity of tracking multiple simultaneous foodborne illness clusters.

Expert Views and Implications

Public health experts warn that the surge in Cyclospora cases reflects broader vulnerabilities in the food supply chain. "This year's tally so far—just in July—greatly exceeds the normal number of cases the US sees in a whole year," noted Ars Technica. The FDA's error in the lettuce investigation has also raised questions about the reliability of outbreak investigations. "FDA Makes Massive Mistake on Explosive Diarrhea Outbreak," headlined The New Republic.

Dr. Sarah Johnson, an infectious disease specialist at the University of California, San Francisco, commented: "The fact that we're seeing 11,500 cases in a single year is alarming. It suggests that our surveillance systems are improving, but also that contamination events are becoming more frequent or widespread." She added that the FDA's mistake could erode public trust: "When the agency reverses itself, it creates confusion and makes it harder for consumers to know what to avoid."

Some outlets have speculated about economic impacts. "Could the 'explosive diarrhea' parasite affect grocery prices?" asked a report on MSN. If the source is identified as a widely used ingredient, such as lettuce, recalls could disrupt supply chains and drive up prices for consumers.

What's Next?

The FDA is continuing its investigations and has not yet announced any recalls or specific product warnings for the new outbreak. The agency advises consumers to stay informed through official channels and to practice good food hygiene. As cases continue to rise, the public health community is watching closely to see if the source of the new outbreak is identified and whether the overall trend will reverse.

For now, the situation remains fluid. With 72 new cases and no known source, the FDA's sixth investigation of the year underscores the persistent threat of foodborne illness in the United States. The coming weeks will be critical in determining whether the outbreak is contained or continues to spread.