CDC Warns of Rising Cyclospora Infections Across the United States: What You Need to Know

The U.S. Centers for Disease Control and Prevention (CDC) has issued a nationwide health alert following an unusual increase in cases of cyclosporiasis, an intestinal illness caused by the parasite Cyclospora cayetanensis. Health officials are urging doctors to stay alert, especially when treating patients with persistent watery diarrhea during the summer months.

The rise in infections has prompted public health agencies to investigate the source of the outbreak. While contaminated fresh produce is considered the leading suspect, investigators have not yet identified a specific food product, supplier, or farm responsible for the increase.

CDC Reports Significant Increase in Cases

According to the CDC, more than 1,600 confirmed cases of cyclosporiasis have been reported across the United States. In addition, health officials are reviewing over 5,000 suspected cases that may also be linked to the outbreak.

Most confirmed infections have been reported in several Midwestern states, including Michigan, Kentucky, Ohio, and West Virginia. Other states, such as Connecticut and New York, have also experienced higher than expected case numbers.

Health experts believe the outbreak could involve multiple clusters, although current evidence suggests that many cases in the hardest hit states may be connected through a common source.

What Is Cyclospora?

Cyclospora is a microscopic parasite that infects the intestines and causes an illness known as cyclosporiasis. People become infected by consuming food or water contaminated with the parasite, typically through fecal contamination.

Unlike many common stomach viruses, Cyclospora is not usually spread directly from one person to another because the parasite requires time outside the human body before it becomes infectious.

Fresh fruits and vegetables have been linked to previous Cyclospora outbreaks, making proper food handling especially important.

Symptoms of Cyclospora Infection

Symptoms generally appear between two days and two weeks after exposure to the parasite. The severity of illness can vary, but many people experience prolonged digestive symptoms.

Common symptoms include:

• Watery diarrhea
• Frequent loose stools
• Stomach cramps
• Loss of appetite
• Fatigue
• Nausea
• Weight loss in some cases

Without treatment, symptoms may continue for several weeks and can sometimes improve before returning again.

Why the CDC Issued the Health Alert

The CDC's health advisory is primarily directed at doctors, hospitals, and public health professionals. Officials want healthcare providers to consider Cyclospora infection when evaluating patients with ongoing gastrointestinal illness.

Routine stool testing does not always include screening for Cyclospora. Because of this, healthcare providers are encouraged to specifically request laboratory testing for the parasite when patients have persistent watery diarrhea.

Early diagnosis can help patients receive appropriate treatment while also assisting investigators in tracking the outbreak.

Hospitalizations Reported

Although most people recover, the illness can become severe enough to require hospitalization.

Current CDC data indicates that approximately one out of every ten confirmed patients has been hospitalized during this outbreak. Fortunately, no deaths related to the current surge have been reported.

Individuals who become dehydrated from prolonged diarrhea may face the greatest risk of complications, particularly older adults, young children, and people with weakened immune systems.

Possible Link to Leafy Greens

Health investigators are examining whether contaminated lettuce or salad greens may be contributing to the outbreak.

The Michigan Department of Health and Human Services has suggested that leafy greens are among the possible sources under investigation. However, officials have emphasized that no specific product, farm, distributor, or retailer has been identified.

The U.S. Food and Drug Administration (FDA) continues to work alongside the CDC and state health departments to trace the source of the infections.

Since the investigation remains active, consumers should avoid making assumptions about any particular brand or product.

How to Reduce Your Risk

While investigators continue searching for the source, health officials recommend following standard food safety practices.

You can lower your risk by:

• Washing your hands before and after handling fresh produce.
• Rinsing fruits and vegetables thoroughly under running water.
• Cleaning food preparation surfaces regularly.
• Cooking produce when appropriate.
• Staying hydrated if diarrhea develops.

Although washing produce cannot eliminate every possible contaminant, it remains an important step in reducing the risk of foodborne illness.

What Healthcare Providers Should Know

The CDC is advising clinicians to remain alert for patients who present with prolonged watery diarrhea, particularly during the current outbreak period.

Healthcare professionals should:

• Request stool testing specifically for Cyclospora when clinically appropriate.
• Encourage patients to drink plenty of fluids to prevent dehydration.
• Follow standard infection control procedures, including wearing gloves when exposure to fecal matter is possible.

Prompt reporting of confirmed cases can also help public health agencies identify patterns and determine the outbreak source more quickly.

When to Seek Medical Attention

People experiencing diarrhea that lasts several days or longer should contact a healthcare provider, especially if symptoms become severe.

Medical attention is particularly important if you experience:

• Persistent watery diarrhea
• Signs of dehydration
• Severe abdominal pain
• High fever
• Bloody stools
• Symptoms lasting more than a few days

Your healthcare provider may recommend specialized stool testing if Cyclospora infection is suspected.

Ongoing Investigation

Federal and state health agencies continue working together to determine exactly what caused the recent spike in Cyclospora infections.

Because foodborne outbreak investigations often involve tracing products through complex supply chains, identifying a single source can take time. Officials say additional updates will be provided as more evidence becomes available.

Until then, consumers are encouraged to follow recommended food safety practices and seek medical advice if they develop prolonged gastrointestinal symptoms.

Final Thoughts

The recent increase in Cyclospora infections serves as a reminder that foodborne illnesses remain an important public health concern. While most people recover with appropriate care, early diagnosis and proper hydration are essential for reducing complications.

Healthcare providers are being encouraged to consider Cyclospora testing more frequently during this outbreak, while public health officials continue investigating the source. Consumers can also play an important role by practicing good food hygiene and staying informed through trusted health authorities.

Source: U.S. Centers for Disease Control and Prevention (CDC), U.S. Food and Drug Administration (FDA), and reporting based on information.

Disclaimer: This article is intended for informational and educational purposes only. It should not be considered medical advice, diagnosis, or treatment. If you experience persistent diarrhea or other concerning symptoms, consult a qualified healthcare professional promptly. Information is based on publicly available reports at the time of writing and may change as new findings emerge.