Parasitic illness cases are climbing sharply across the United States, prompting health investigations as officials scramble to pin down where the sickness is coming from. The culprit is a lesser-known parasite that thrives in warmer months, and the recent spike has caught the attention of authorities from coast to coast.

What the Numbers Reveal

The Centers for Disease Control and Prevention announced this week that it had been alerted to 145 cases of cyclosporiasis between May and the middle of June. While infections from this parasite tend to rise every year during the warmer stretch from early May through the end of August, certain regions are now reporting figures well above what’s typical.

Michigan offers a striking example. State health officials logged more than 170 cases across seven counties in just nine days, a dramatic jump for a state that usually records around 50 cases in an entire year. Dr. Natasha Bagdasarian, the state’s chief medical executive, warned that even more cases are likely to surface in the coming days.

Understanding the Parasite

At the heart of these parasitic illness cases is an organism called Cyclospora cayetanensis, a parasite that remains relatively uncommon in the United States. It spreads through food and water that have been contaminated with feces, which is why hygiene and food handling play such a central role in prevention.

For some people, infection happens abroad. According to Wisconsin health officials, travelers who visit countries where the parasite is more widespread may unknowingly bring it home with them.

Within the U.S., however, the illness is more frequently tied to contaminated fresh produce. Items that have been linked to past outbreaks include:

• Romaine lettuce
• Fresh basil and cilantro
• Snow peas
• Raspberries

For now, the CDC is still working to identify the exact source of the current wave of infections. Importantly, the agency has stated that there is no evidence pointing to a single, multistate outbreak, suggesting the cases may stem from multiple unrelated sources.

A Small Silver Lining

There is at least one piece of reassuring news buried in this story. Cyclosporiasis is unlikely to pass directly from one person to another. For anyone familiar with just how unpleasant the symptoms can be, that lack of person-to-person transmission may come as a genuine relief.

The Symptoms to Watch For

Not everyone who picks up the parasite will actually feel sick. But for those who do develop symptoms, the experience can be memorably uncomfortable.

According to the CDC and the Cleveland Clinic, the hallmark sign is frequent, watery diarrhea that can be loud and, in their words, sometimes explosive. It’s not exactly a subtle illness.

Beyond that primary symptom, infected individuals may also notice:

• A loss of appetite
• Nausea and vomiting
• Stomach cramps
• Bloating, along with burping and gas
• A low-grade fever
• Extreme fatigue

One of the trickier aspects of this illness is its timing. Symptoms can take anywhere from two days to two full weeks to appear after infection, which can make it difficult to connect the sickness to whatever food or water caused it.

When to See a Doctor

Health experts strongly encourage anyone experiencing these symptoms to reach out to a healthcare provider. Michigan officials specifically urged people dealing with sudden gastrointestinal illness to get evaluated by a medical professional rather than simply waiting it out.

The reason for caution lies in how unpredictable the recovery can be. People with healthy immune systems may bounce back on their own, but others aren’t so fortunate. The CDC notes that some patients remain sick anywhere from a few days to a month or even longer.

To complicate matters further, the symptoms have a tendency to come and go rather than steadily improving. That fluctuating pattern means certain individuals face a real risk of a severe or drawn-out illness, making professional care all the more important.

How to Protect Yourself

The good news is that a few straightforward habits can significantly reduce your risk. Since contaminated produce is a common source of infection in the U.S., proper food handling is your best line of defense.

Health experts recommend the following precautions:

• Wash all produce thoroughly before eating, cutting, or cooking it. A careful rinse can help remove contaminants clinging to the surface.
• Refrigerate promptly. If you’ve cut, peeled, or cooked fruits and vegetables, get them into the fridge as soon as possible to limit any potential growth of harmful organisms.
• Trim away trouble spots. Cutting off damaged or bruised areas of fruits and vegetables before use can help eliminate places where contamination might linger.

These simple steps won’t just guard against this particular parasite. They form the foundation of good food safety in general, offering protection against a range of foodborne illnesses.

Why This Spike Matters

The current surge in parasitic illness cases serves as a timely reminder that foodborne threats don’t always come from obvious sources. Fresh, healthy produce, the very foods we’re encouraged to eat more of, can occasionally carry hidden risks if not handled properly.

It also highlights the seasonal nature of certain infections. As summer brings warmer temperatures and a greater abundance of fresh fruits and vegetables, the conditions become more favorable for cyclosporiasis to spread. Being aware of that pattern can help people stay vigilant during the months when the parasite is most active.

The Bottom Line

While the rise in cases is certainly worth paying attention to, there’s no need to panic. Cyclosporiasis is treatable, doesn’t spread between people, and can often be avoided altogether with careful food preparation.

The key takeaways are simple: know the symptoms, especially that unmistakable watery diarrhea, and don’t hesitate to seek medical care if you suspect you’ve been infected. Meanwhile, adopting solid produce-washing and food-storage habits can go a long way toward keeping you and your family safe.

As health officials continue investigating the source of this year’s spike, staying informed and cautious remains the smartest approach. A little extra care in the kitchen this summer could spare you a thoroughly miserable, and potentially lengthy, bout of illness.

This article discusses a health condition for general informational purposes and is not a substitute for professional medical advice. If you’re feeling unwell or have concerns about your health, please consult a qualified healthcare provider.