A growing outbreak of cyclosporiasis, an intestinal illness caused by the microscopic parasite Cyclospora cayetanensis, has affected multiple US states and prompted investigations by health authorities. While no deaths have been reported, officials are working to identify the source of the outbreak as cases continue to rise, particularly in Michigan. Health experts say the illness is usually linked to contaminated food or water, with fresh produce remaining the leading suspected source.
Key Takeaways: US Cyclospora Outbreak
- Cyclosporiasis is caused by the microscopic parasite Cyclospora cayetanensis.
- The illness mainly spreads through contaminated food or water rather than person-to-person contact.
- Frequent, watery and sometimes “explosive” diarrhoea is the most common symptom.
- Michigan has reported the largest surge in cases, while infections have also been reported in several other US states.
- Health authorities have not identified the exact food source and investigations remain ongoing.
- Previous outbreaks have been linked to contaminated fresh produce such as salad greens, basil, cilantro and raspberries.
What is behind the US Cyclospora outbreak?
Health officials across the United States are investigating a rise in cyclosporiasis cases after infections were reported in more than a dozen states. Earlier CDC surveillance recorded 145 reported cases between May 1 and June 16, with 20 hospitalisations and no deaths. State health departments later reported a significant increase in infections, especially in Michigan, where the outbreak has become the state’s largest on record.
According to the Michigan Department of Health and Human Services (MDHHS), the outbreak continues to grow, but investigators have not identified a specific produce grower, supplier or food item responsible for the infections.
What is Cyclospora and how does it spread?
Cyclosporiasis is an intestinal illness caused by the microscopic parasite Cyclospora cayetanensis. People become infected after consuming food or water contaminated with the parasite.
Unlike many stomach infections, Cyclospora does not spread directly from one person to another. Epidemiologist Dr. Caitlin Rivers of the Johns Hopkins Center for Health Security explained that the parasite must mature outside the human body before it becomes infectious, making transmission primarily foodborne or waterborne through faecal contamination.
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Health authorities say contamination usually occurs at the farm or irrigation level, making investigations difficult.
Which areas have reported cases?
The CDC reported outbreaks across 17 states, including Illinois, New York and Texas. State health departments have since announced additional increases.
| State | Reported situation |
| Michigan | Largest outbreak, with cases rising sharply during late June and early July |
| Illinois | 141 reported cases |
| Ohio | 177 reported cases |
| Other affected states | New York, Texas and several additional states under investigation |
Officials note that the actual number of infections is likely higher because many people recover without medical care or laboratory testing.
Symptoms of cyclosporiasis
The illness usually develops about one week after consuming contaminated food or water, although symptoms can appear anywhere from two days to two weeks later.
Common symptoms include:
- Frequent watery diarrhoea
- Explosive bowel movements
- Abdominal cramps
- Nausea and vomiting
- Bloating and excess gas
- Fatigue
- Loss of appetite
- Low-grade fever
- Weight loss in prolonged illness
If left untreated, symptoms may continue for several days to more than a month and may disappear before returning again.
Who is most at risk?
Anyone who consumes contaminated food or water can become infected. However, health experts say the illness can be more severe in:
- Young children
- Older adults
- Pregnant women
- People with weakened immune systems
- Travellers to regions where Cyclospora is more common
Although the disease is generally not life-threatening, prolonged diarrhoea can lead to dehydration and other complications if left untreated.
Why is the investigation taking time?
Officials say tracing the source is challenging because symptoms often begin days or weeks after exposure. By then, many people cannot accurately remember what they ate.
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Fresh produce also moves through complex supply chains involving multiple farms, distributors and retailers, making it difficult to identify the original source of contamination. Previous outbreaks in the US and Canada have been linked to bagged salad mixes, cilantro, basil, raspberries, snow peas and green onions.
How can people reduce their risk?
Health authorities recommend several precautions while the investigation continues:
- Wash fruits and vegetables under running water before eating or preparing them.
- Remove damaged or outer layers of leafy vegetables where appropriate.
- Cook vegetables and leafy greens when possible, as heat destroys the parasite more effectively than washing.
- Wash hands thoroughly before handling food.
- Clean knives, cutting boards and kitchen surfaces.
- Refrigerate perishable foods promptly.
- Avoid untreated water, particularly while travelling.
The CDC continues to recommend rinsing produce, although the US Food and Drug Administration notes that washing alone may not completely eliminate the parasite. Anyone experiencing persistent diarrhoea should contact a healthcare provider and ask about testing for Cyclospora infection.
Public Health Response Continues
Federal and state health agencies continue to investigate the outbreak to identify its source and prevent additional illnesses. Officials emphasise that no deaths have been linked to the current outbreak, but they urge people with prolonged watery diarrhoea to seek medical care promptly. As investigations continue, authorities say following food safety guidance remains the most effective way to reduce the risk of infection.
Faith, Righteous Living and Inner Strength
Many spiritual traditions teach that maintaining a disciplined life, compassion, and devotion can help people face physical and emotional challenges with resilience.
Tatvadarshi Sant Rampal Ji Maharaj emphasises living a moral life, avoiding harmful habits, and practising true devotion to God. His Followers believe that sincere spiritual practice, along with righteous conduct, brings inner peace and strength during difficult times. At the same time, illnesses such as cyclosporiasis require timely medical attention and adherence to the guidance issued by public health authorities.
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FAQs on Explosive Diarrhoea in US
1. What causes cyclosporiasis?
It is caused by the microscopic parasite Cyclospora cayetanensis.
2. How does Cyclospora spread?
It spreads through contaminated food or water, not by direct person-to-person contact.
3. What is the main symptom?
Frequent watery diarrhoea, often described as explosive, is the most common symptom.
4. Has the outbreak source been identified?
No. Health authorities are still investigating the exact source.
5. How can people reduce the risk of infection?
Wash produce, practise good food hygiene, cook vegetables when possible and seek medical care for persistent diarrhoea.
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