Cyclospora outbreak exceeds 3,000 cases in Michigan and Ohio: they investigate lettuce and salads

An outbreak of diarrhea due to the Cyclospora parasite already has more than 3,000 cases in Michigan and Ohio, according to coverage published on July 13, 2026. The authorities are investigating lettuce and green leaves as a possible source, although they have not yet identified a specific brand, farmer or supplier and have not ruled out other foods. The journalist Jay Fonseca summarized the alert in href="https://www.cnn.com/2026/07/13/health/cyclospora-parasite-diarrhea-outbreak-increase" target="_blank" rel="noopener noreferrer">CNN; At the time of his message Puerto Rico was not mentioned.

What the figures say

According to the CNN cable collected by local media, Michigan recorded 2,640 cases on Monday with 44 hospital admissions. Ohio had 361 cases since June 1. Between both states there are at least 46 hospitalizations. Michigan, in a typical year, sees on the order of 50 infections: the jump in July is exceptional.

At the federal level, the CDC had confirmed 843 domestic cases between May 1 and July 9, with reports in 31 states. The agency clarifies that state counts are usually higher while cases are validated. ABC News also located peaks in New York, Illinois and Florida (more than 100 cases in those last states at the end of the previous week).

Why they target lettuce (and why there is no recall yet)

Dr. Natasha Bagdasarian, Michigan's chief medical officer, said that "early data shows lettuce as a common product that shows up again and again" in research. He insisted that other foods are not ruled out and that there is no national recall of any product linked to the outbreak.

Locating the source is slow: symptoms may appear days or weeks after exposure; it is necessary to remember what was eaten; The stool test sometimes must be repeated because the parasite is eliminated intermittently; and the genetic profile of Cyclospora is more complex to match than that of bacteria such as Salmonella or E. coli, according to experts cited by CNN. Michigan claims to have already completed more than 1,000 interviews out of a confirmed universe of more than 2,600.

Symptoms, contagion and treatment

Cyclosporiasis usually causes severe watery diarrhea, cramping, bloating, nausea, and fatigue that can last weeks. Dehydration is the main reason for hospitalization. It is not easily transmitted from person to person: it is acquired by ingesting contaminated food or water, it almost always produces fresh. Previous outbreaks in the US and Canada have been associated with salad mixes, cilantro, basil, raspberries, peas and chives.

The usual treatment, under medical prescription, is a 7 to 10 day regimen of sulfamethoxazole-trimethoprim (Bactrim or Septra). Anyone with prolonged diarrhea should seek medical attention; the laboratory sometimes needs a special request to detect Cyclospora.

What Michigan recommends to reduce risk

• Prefer whole lettuce over pre-cut or "ready-to-eat" bags.
• Discard the 2–3 outer layers and wash the inner leaves under running water.
• Wash herbs and vegetables thoroughly; cook when possible (heat kills the parasite).
• In southeastern Michigan, restaurants and commercial kitchens have received specific guidance on crude oil production.

The HHS indicated that cyclosporiasis cases usually increase in the summer and that the FDA and the CDC work with states. CNN also recalls that, after cuts in 2025, the FoodNet network stopped compulsorily collecting data on several pathogens - including Cyclospora -, which complicates early surveillance although the disease remains nationally notifiable.

In summary

What? Outbreak of cyclosporiasis (Cyclospora parasite). Where does it hurt the most? Michigan (2,640) and Ohio (361). What is being investigated? Lettuce and salads, no culprit identified. What to do? Wash produce, prefer whole lettuce and consult a doctor if the diarrhea does not subside. Puerto Rico? In the advertisement made viral by Jay Fonseca the archipelago was not mentioned.