Cyclospora Outbreaks: Understanding the Seasonal Rise of the Parasite
Cyclospora is a foodborne parasite causing a spike in gastrointestinal illness across the United States, with 17 states reporting cases as of mid-summer. According to the U.S. Centers for Disease Control and Prevention (CDC), 145 cases were linked to domestic exposure by June 16. In Michigan, the state health department reported a surge to 572 cases in July, marking a significant increase from 170 cases at the end of June.
What is Cyclospora and How Does it Spread?
Cyclospora is a microscopic parasite that infects the human gut, leading to a distinct, severe form of diarrhea. Dr. Steven Goldberg, chief medical officer for the infectious disease laboratory HealthTrackRx, describes the condition as “explosive diarrhea.”
Unlike many other foodborne pathogens, Cyclospora is not transmitted from person to person. Infection occurs exclusively through the consumption of contaminated food. Dr. Goldberg notes that the cycle of transmission typically begins when someone carrying the parasite inadvertently introduces fecal matter into food preparation or service environments.
Did you know?
Cyclospora infections are highly seasonal. The primary risk period in the United States runs from May 1 through August 31, aligning with peak harvest times for various types of fresh produce.
Produce Linked to Cyclospora Contamination
The parasite thrives on produce with rough, irregular surfaces, which provide crevices for the organism to hide and latch onto. Food items frequently identified in FDA investigations since 2013 include:
- Fresh herbs, particularly cilantro and parsley
- Leafy greens, including mesclun lettuce and spinach
- Salad mixes
- Snow peas
- Berries such as raspberries, blueberries, and blackberries
Symptoms and Medical Intervention
While various organisms cause digestive distress, Cyclospora is characterized by its intensity. Common symptoms identified by the CDC include:
- Watery, explosive diarrhea
- Loss of appetite and weight loss
- Abdominal cramping and bloating
- Increased gas
- Nausea and fatigue
Less common symptoms may include vomiting, body aches, headaches, and low-grade fevers. While many people recover within a few days, Dr. Goldberg advises that those experiencing persistent nausea, vomiting, or an inability to maintain fluid intake should seek medical care, as severe cases may require antibiotics.
Proactive Prevention Strategies
Standard rinsing is often insufficient to remove the parasite from irregular produce surfaces. Dr. Goldberg recommends manual cleaning of the produce surface combined with a forceful water flow. The use of bleach or other chemical surface-cleaning agents is not recommended for food preparation.
The CDC provides additional guidelines for reducing the risk of infection:
- Hand Hygiene: Wash hands thoroughly with soap and water before and after handling raw produce.
- Preparation: Scrub firm items like melons and cucumbers with a clean produce brush. Cut away any bruised or damaged sections of fruits and vegetables.
- Storage: Refrigerate cut, peeled, or cooked produce within two hours to prevent bacterial or parasitic growth.
Note that produce labeled “prewashed” does not require additional cleaning at home.
Future Trends and Ongoing Investigations
The rise in reported cases has sparked concern among public health officials, as the parasite is increasingly appearing on domestically grown produce. While there is no current evidence linking all cases to a single multistate outbreak, the frequency of these events has accelerated in recent years.
“We’re seeing now this year an acceleration of food-related illness in the United States,” Dr. Goldberg stated. “We don’t have a single explanation for it. It’s not clear if it is coming from farms or if there are other sources involved.”
Frequently Asked Questions
Can I wash Cyclospora off with vinegar or bleach?
No. Dr. Goldberg advises against using bleach or other chemicals. Instead, use a forceful flow of water and manually scrub the surface of the produce.
Is Cyclospora contagious?
No. The parasite does not spread through human-to-human contact. It is strictly a foodborne illness.
What should I do if I think I have a Cyclospora infection?
If you experience persistent diarrhea, fever, or are unable to keep fluids down, consult a healthcare provider. They can determine if antibiotics are necessary to clear the infection.
Have you taken extra precautions with your produce this summer? Share your food safety tips in the comments below or subscribe to our health newsletter for the latest updates on foodborne illness outbreaks.
=== END ARTICLE ===