US 'Explosive Diarrhoea' Outbreak: What's Happening, How Cyclospora Spreads And Should India Be Concerned?

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The US is currently witnessing a multi-state outbreak of an illness popularly being described as "explosive diarrhoea", sparking concern across the country. However, health authorities have clarified that this is not a new virus. Instead, the outbreak has been linked to cyclosporiasis, an intestinal infection caused by the microscopic parasite Cyclospora cayetanensis.

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The term "explosive diarrhoea" simply describes one of the infection's most common symptoms-sudden, forceful and watery bowel movements. Here's everything you need to know about the ongoing outbreak, its symptoms, treatment and whether people in India should be worried.

US 'Explosive Diarrhoea' Outbreak: What's Happening?

The US Centers for Disease Control and Prevention (CDC), in collaboration with state health departments and the Food and Drug Administration (FDA), is investigating a large, ongoing outbreak of cyclosporiasis linked to food consumed within the United States.

The outbreak has spread across multiple states during the summer months, with thousands of confirmed and suspected cases under investigation. Health officials have also cautioned that the actual number of infections could be higher due to delays in reporting.

Latest US Outbreak Numbers

According to the latest reports (as of July 2026):

• 1,645 laboratory-confirmed cases reported by the CDC
• More than 5,100 additional suspected cases under investigation
• Cases reported across 34 US states
• More than 140 people have been hospitalised
• No deaths have been reported so far

Which US States Are Most Affected?

Michigan has emerged as the hardest-hit state in the ongoing outbreak. Other states reporting significant numbers of cases include:

• Michigan
• Ohio
• Kentucky
• West Virginia
• New York
• California (where many cases have been linked to travel)

What's Causing The Outbreak?

Health officials believe the outbreak is linked to contaminated fresh produce, although investigations are still underway.

Foods currently being examined include:

• Lettuce
• Bagged salad mixes
• Salad greens
• Fresh herbs such as cilantro and basil
• Green onions
• Fresh berries

So far, investigators have not identified a single food item, supplier or brand responsible for the outbreak. No nationwide food recall has been issued.

Is Taco Bell Linked To The Outbreak?

Some patients reported eating at Taco Bell before falling ill, prompting investigators to examine whether lettuce served at certain outlets could be connected to the outbreak.
However, officials have clarified that:

• No definitive link has been established.
• Investigations are still ongoing.
• Some Taco Bell restaurants in Michigan temporarily removed certain fresh produce items as a precaution.
• There is no nationwide advisory against eating at Taco Bell.

What Is Cyclospora?

Cyclospora cayetanensis is a microscopic parasite that infects the small intestine and causes an illness known as cyclosporiasis. People usually become infected after consuming:

• Contaminated fresh produce
• Contaminated drinking water

Unlike many bacterial foodborne illnesses, Cyclospora does not usually spread directly from person to person because the parasite must first mature outside the human body before becoming infectious.

Symptoms Of Cyclospora Infection

Symptoms typically appear about one week after infection, although they can develop anywhere between 2 and 14 days after exposure.

Common symptoms include:

• Watery diarrhoea
• Frequent or "explosive" bowel movements
• Abdominal cramps
• Bloating
• Excessive gas
• Nausea
• Loss of appetite
• Fatigue
• Low-grade fever
• Weight loss

Without treatment, symptoms can persist for several weeks and may even come and go over time.

Why Is This Outbreak Difficult To Trace?

Public health experts say Cyclospora outbreaks are particularly difficult to investigate because:

• Symptoms often appear a week or more after eating contaminated food, making it difficult for patients to remember what they consumed.
• Fresh produce passes through complex supply chains involving multiple farms, distributors and retailers.
• Common foods like salads and leafy greens are consumed by many people, making it harder to pinpoint a single source.

How Is Cyclosporiasis Treated?

Cyclosporiasis is treatable with appropriate medical care.

Doctors usually prescribe the antibiotic trimethoprim-sulfamethoxazole (TMP-SMX) for confirmed infections. Staying well-hydrated is equally important, as prolonged diarrhoea can lead to dehydration. Individuals who are allergic to sulfa-based medicines should consult their healthcare provider about suitable alternatives.

How Can You Protect Yourself?

Health experts recommend the following preventive measures:

• Wash fresh fruits and vegetables thoroughly under running water.
• Wash your hands with soap and water before preparing or eating food.
• Clean kitchen utensils and cutting boards after handling fresh produce.
• Cook food thoroughly whenever appropriate.
• Seek medical attention if you develop prolonged watery diarrhoea, especially if it is accompanied by signs of dehydration.

Should Indians Be Concerned?

At present, the outbreak is limited to the United States, and there is no evidence of a similar outbreak in India. However, the incident serves as an important reminder about practising good food hygiene. Washing fresh fruits and vegetables thoroughly, consuming safe drinking water and maintaining proper hand hygiene can significantly reduce the risk of foodborne infections, including cyclosporiasis.

What Is The Latest Update On The US 'Explosive Diarrhoea' Outbreak?

The US continues to investigate the multi-state outbreak of cyclosporiasis, with contaminated fresh produce remaining the leading suspect. While lettuce and salad greens are under scrutiny, authorities have not yet identified the exact source or announced any nationwide food recalls. Investigations by the CDC and FDA are ongoing, and health officials continue to monitor the situation closely.

Disclaimer: The information provided in this article is for general informational and educational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or a qualified healthcare provider with any questions you may have regarding a medical condition.