Florida’s Summer Cyclospora Outbreak: What’s Making So Many People Sick

Nobody expects a salad to end up in the headlines, but that’s exactly what’s happening across the country right now. A wave of cyclosporiasis, an intestinal infection tied to a microscopic parasite, has sickened thousands of people since May, with health officials tracing cases back to shredded lettuce served at popular restaurant chains. If you’ve noticed friends or coworkers canceling plans because of sudden stomach problems, this outbreak might be why.

This isn’t the first time cyclospora has made its way into American kitchens and restaurants, but the scale of this year’s outbreak has caught attention from coast to coast. Florida, including the Tampa Bay area, has already reported rising case counts.

The Outbreak That Started With a Salad

Health officials first noticed something unusual in late June, when case reports began climbing sharply across Michigan, Ohio, West Virginia, and Kentucky. Within weeks, the CDC confirmed over 1,600 cases nationwide and flagged thousands more as possible infections spanning 34 states. Michigan alone reported thousands of cases, making it the epicenter of the outbreak, but smaller clusters have popped up in states far from the Midwest, including Florida.

Investigators linked a portion of the illnesses to shredded iceberg lettuce distributed through food service suppliers, prompting recalls of affected products. Health officials have also noted that this source explains only part of the outbreak, with multiple unrelated clusters still under investigation. Because several potential sources are being examined, this year’s outbreak has proven more complex than a typical single-source food recall.

A Parasite With an Unusually Long Incubation Period

One reason cyclospora outbreaks drag on for weeks is the parasite’s incubation period. Symptoms sometimes take up to two weeks to appear after exposure, and confirming a diagnosis through lab testing adds even more time. By the time someone sits down with a doctor to talk through what they ate, the meal that made them sick might be a distant memory. That lag helps explain why investigators are still working to identify every source feeding into this year’s numbers, and why case counts keep climbing even as recalls take effect.

How Cyclospora Ends Up on Your Plate

Cyclospora cayetanensis lives in human feces, and it spreads when contaminated water touches food, most often fresh produce. Farms rely on water for irrigation and washing crops, so if that water carries trace amounts of the parasite, it may end up on leafy greens, herbs, or berries long before they reach a grocery shelf or restaurant kitchen. The parasite needs time outside the body to mature into an infectious form, generally one to two weeks, which is part of why direct person-to-person spread is considered unlikely.

Fresh produce sits at the center of nearly every past outbreak. Bagged salad mixes, cilantro, basil, raspberries, snow peas, and green onions have all been linked to cyclosporiasis in previous years. This year, shredded iceberg lettuce has taken the spotlight, but food safety experts caution that more than one source is probably driving the current surge.

Symptoms That Go Beyond a Typical Stomach Bug

A lot of people brush off early GI issues as something they ate or a passing stomach bug, but cyclosporiasis tends to hit harder and linger longer than the usual 24-hour scare. The hallmark symptom is watery, frequent diarrhea, often described by patients as far more intense than standard food poisoning. Left untreated, symptoms may stretch on for weeks and lead to noticeable weight loss and fatigue.

Common symptoms include:

• Watery, frequent diarrhea that doesn’t improve after a day or two
• Nausea and loss of appetite
• Stomach cramping or bloating
• Vomiting
• Fatigue and general body aches
• Low-grade fever in some cases

Most healthy adults recover without hospitalization, though dehydration remains the biggest risk, especially for young children, older adults, and anyone with a weakened immune system. Because cyclospora symptoms can overlap with other gastrointestinal illnesses, proper testing is important before treatment is recommended. Healthcare providers typically recommend testing for watery diarrhea that has lasted seven days or longer rather than starting antibiotics without a confirmed diagnosis.

What’s Been Recalled and What to Watch For

Grocery shopping during an active outbreak understandably makes people a little more cautious, and that instinct is a good one right now. The recalled lettuce products, distributed to Walmart under the Marketside brand, included Iceberg Salad and Shredded Lettuce items with “best if used by” dates in the July 18 through August 3 window. Beyond that specific recall, health officials continue investigating other produce items tied to smaller, separate clusters around the country. Foods historically linked to cyclospora outbreaks include:

• Pre-washed or bagged salad mixes
• Fresh cilantro and basil
• Raspberries
• Green onions
• Snow peas
• Shredded or chopped lettuce, particularly from food service suppliers

Food safety experts have been quick to point out that the vast majority of produce on shelves right now has nothing to do with this outbreak, and there’s no reason to swear off fresh fruits and vegetables altogether. A little extra attention at the sink goes a long way.

Simple Habits That Lower Your Risk

Protecting yourself from cyclospora doesn’t require an overhaul of how your household eats. It comes down to a handful of habits practiced consistently, especially during the summer months when cyclosporiasis tends to spike.

Rinse and Scrub Before You Eat

Rinse fresh produce under running water, even items with a peel, since bacteria and parasites transfer easily from the outside of a fruit to the inside once it’s cut. Firm vegetables benefit from a scrub with a clean produce brush. Soap and produce cleaners aren’t necessary and aren’t recommended for this step, plain water does the job.

Cook, Peel, and Trim When Possible

Heat destroys the parasite, so cooking produce to at least 158 degrees Fahrenheit offers strong protection when that’s an option. Peeling fruits and vegetables, or removing the outer leaves of leafy greens before rinsing the inner leaves, cuts down exposure as well. Trimming away any damaged or bruised sections before eating removes another potential entry point.

Wash Hands Before Handling Food

Hand hygiene before and after preparing raw produce matters just as much as washing the produce itself. This habit interrupts the chain of contamination at the source, particularly in busy kitchens where multiple people handle the same cutting board or utensils throughout meal prep.

When Stomach Problems Are a Sign to Get Checked Out

A day of stomach discomfort after a questionable meal happens to almost everyone. What sets cyclosporiasis apart is how long it lingers and how disruptive the diarrhea, nausea, and vomiting become. Watery diarrhea lasting seven days or longer, signs of dehydration, or GI issues accompanied by fever are all good reasons to seek medical evaluation. Older adults, young children, pregnant patients, and anyone managing a chronic condition may also benefit from being evaluated sooner if symptoms become severe or dehydration develops. Older adults, young children, pregnant patients, and anyone managing a chronic condition face a higher risk of complications and benefit from being seen sooner rather than later.

Get Checked Out Without the Wait

Persistent diarrhea, nausea, or stomach cramps deserve a real evaluation, not a guessing game at home. TGH Urgent Care powered by Fast Track treats foodborne illness and dehydration symptoms across several Tampa Bay area locations, serving patients throughout Hillsborough, Pinellas, Pasco, Lee, and Charlotte counties. Every location is open seven days a week from 8 a.m. to 8 p.m., making it easy to get seen the same day symptoms start feeling like more than a passing bug. The Save My Spot e-check-in system lets patients fill out paperwork electronically ahead of time, cutting down wait times once they arrive. If stomach problems have kept you sidelined for more than a day or two, a visit could get you back on track faster than riding it out alone.