New Cyclospora Outbreak: Key Facts & Public-Health Response

Overview of the Current Outbreak

Health officials are tracking the largest cyclosporiasis outbreak ever recorded in the United States, with thousands of confirmed cases spanning more than 30 states. The Centers for Disease Control and Prevention (CDC), Food and Drug Administration (FDA), and state health departments are actively investigating, yet the source of contamination remains unknown. Source 1 Source 2

About Cyclospora cayetanensis

Cyclospora cayetanensis is a microscopic parasite that causes prolonged, watery diarrhea and other gastrointestinal symptoms. The infection is transmitted almost exclusively through contaminated fresh produce or water. Source 3 Source 7

Geographic & Demographic Impact

The highest case counts are concentrated in eastern and midwestern states, while no specific age group or population has been identified as uniquely vulnerable. Source 5 Source 10

Investigation Status & Food-Safety Measures

The FDA has ruled out certain products, including a recent Taylor Farms false-positive, but has not yet linked any single item to the illnesses. Trace-back and sampling of leafy greens and other produce in the supply chain are ongoing. Source 4 Source 9

Climate-Linked Factors

Experts suggest that warming temperatures and shifting produce supply chains may be contributing to the unprecedented scale of the outbreak. Source 5

Prevention Guidance for Consumers

Wash all fresh fruits and vegetables thoroughly under running water. When possible, choose produce from known domestic suppliers and follow any public-health advisories. Source 3

FAQ

What are the main symptoms of cyclosporiasis?
Severe watery diarrhea, fatigue, stomach cramps, bloating, and weight loss lasting from days to weeks.

How long after exposure do symptoms start?
Symptoms typically appear about one week after ingesting contaminated food or water.

Is there a specific food I should avoid right now?
No single product has been confirmed; however, health officials recommend extra caution with leafy greens until the source is identified.

Who is most at risk for severe illness?
Immunocompromised individuals and the elderly can experience more prolonged or complicated infections.

How is cyclosporiasis treated?
A combination antibiotic (usually trimethoprim-sulfamethoxazole) is prescribed; over-the-counter anti-diarrheals may ease symptoms but do not cure the infection.

What should I do if I think I have cyclosporiasis?
Contact your healthcare provider for testing and possible treatment, and report the illness to your local health department to aid the investigation.