The United States is witnessing a record surge in cyclospora infections, with preliminary state-level data indicating that 2026 has already become the country's worst year for reported cases of the foodborne illness. More than 30 states have recorded infections this year, surpassing the previous national record of around 4,700 cases reported in 2019. While health officials are still investigating the source of the outbreak, early findings suggest that cases in several states may be linked, with lettuce and salad greens emerging as a possible source in Michigan, the hardest-hit state.

Cyclospora is a microscopic parasite that causes an intestinal illness known as cyclosporiasis. The infection typically leads to prolonged diarrhoea, stomach cramps, nausea, fatigue, loss of appetite and weight loss. Although the illness is generally not life-threatening, it can cause severe discomfort and may persist for weeks if left untreated. Most patients recover after receiving appropriate antibiotic treatment, but public health officials continue to monitor the outbreak because of the unusually high number of infections reported this year.

According to health authorities, more than 30 states have confirmed cyclospora cases in 2026. Federal officials said on Tuesday that investigations indicate there may be different patterns of infection across the country, suggesting that more than one source could be responsible. However, they believe the outbreaks reported in Michigan, Ohio, Kentucky and West Virginia are likely connected, prompting coordinated investigations by state and federal public health agencies to identify the contaminated food product.

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Michigan has reported more than 3,300 cases, accounting for the majority of infections nationwide. After interviewing more than 1,000 patients, investigators from the Michigan Department of Health and Human Services said early evidence points to lettuce or salad greens as a common food consumed by many of those infected. Natasha Bagdasarian, the department's Chief Medical Executive, said that lettuce has consistently emerged during patient interviews as a frequently consumed product, although officials have not yet identified a specific supplier, distributor or brand responsible for the outbreak.

Health officials cautioned that the investigation remains ongoing and that no definitive source has been confirmed. They are continuing to trace food supply chains, analyse purchase histories and compare patient interviews to determine whether contaminated produce or multiple food items are responsible. The US Food and Drug Administration (FDA) and the Centers for Disease Control and Prevention (CDC) are working alongside state agencies to identify the source and prevent additional infections.

Cyclospora outbreaks in the United States have historically been linked to fresh produce such as leafy greens, basil, cilantro and berries, particularly when consumed raw. Because the parasite is transmitted through contaminated food or water rather than person-to-person contact, identifying the exact source can be challenging. Public health officials have advised consumers to remain alert for symptoms of prolonged diarrhoea and seek medical attention if illness develops. While investigations continue, authorities have not issued a recall or advised consumers to avoid lettuce or salad greens, stressing that more evidence is needed before drawing firm conclusions about the source of the outbreak.

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