Cyclosporiasis Handout
You Can't Wash Away Cyclospora — Here's What Actually Works
Cases are running high this summer, and the food safety advice most people reach for doesn't touch this parasite.
The short version
Cyclospora is a microscopic parasite that hitchhikes on fresh produce. Swallow a few, and you can end up with weeks of watery diarrhea, cramping, and exhaustion — the kind that seems to clear up, then comes roaring back.
Here's the uncomfortable part: the two things most people do to protect themselves don't work on this one. Rinsing your produce won't reliably remove it. Keeping food cold won't kill it. Heat kills it, and awareness protects you. That's the list.
This summer is a bad one. As of July 9, 2026, CDC has confirmed 843 cases acquired in the U.S. across 31 states, with 86 hospitalizations and no deaths — plus more than 1,500 additional cases still being analyzed. Because there's roughly a six-week lag between someone getting sick and the case reaching the CDC, those numbers are expected to climb.
Why washing isn't the answer
Cyclospora is wrapped in a tough shell called an oocyst. It grips into microscopic crevices on leaves and skins, and it doesn't rinse off cleanly. CDC notes that routine chemical disinfection or sanitizing is unlikely to kill it — and that goes for commercial produce washes, vinegar soaks, and chlorine rinses too.
This is not permission to stop washing your produce. CDC still recommends rinsing fruits and vegetables under running water, scrubbing firm items like melons, and cutting away bruised spots. Those steps protect you from a long list of other pathogens. Just don't mistake a good rinse for a force field against this particular parasite.
Why the fridge won't save you either
"Don't leave it out at room temperature" is bacteria logic. Salmonella multiplies in food; Cyclospora doesn't. Time on the counter doesn't make produce more contaminated with it, and chilling or freezing doesn't kill it.
Refrigerate cut produce within two hours anyway — CDC advises it, and it matters. It just isn't the lever that stops Cyclospora.
And you won't catch it from a sick family member
Not directly. The parasite needs days to weeks outside the body before it becomes infectious, so it doesn't spread person-to-person the way norovirus does. It comes from contaminated food or water.
So what does work?
Heat. Cooking, boiling, or blanching breaks down the oocyst wall. It's the only reliable kill step — which is exactly why nearly every Cyclospora outbreak traces back to something eaten raw.
Beyond that, your protection comes from knowing what to watch and when:
Know the usual suspects. Outbreaks repeatedly involve fresh cilantro, basil, salad and lettuce blends, spinach, berries, and snow/snap peas — especially imported products in spring and summer.
Watch your state health department. CDC says it outright: states may have more timely information than the national numbers. States report probable cases that CDC doesn't count yet, so your state is often weeks ahead of the federal picture. Search "[your state] health department cyclospora."
Follow recalls. Sign up for FDA and USDA alerts at foodsafety.gov. If a product you have is named, throw it out — don't try to wash it clean.
Be careful traveling. In tropical and subtropical regions, stick to cooked food and treated or bottled water. Chemical treatment won't kill this parasite.
Know the symptoms — and say the word out loud
Symptoms usually start about a week after exposure (range: 2 days to 2+ weeks): frequent watery diarrhea, stomach cramps, nausea, loss of appetite, fatigue, weight loss, sometimes a low-grade fever.
The telltale sign is relapse — symptoms seem to clear up, then return. Untreated, it can drag on for a month or more.
Here's the part worth repeating to readers: Cyclospora doesn't show up on a standard stool test. A provider has to order testing for it specifically. If diarrhea has lasted more than a few days, say the word "Cyclospora" out loud at the appointment. Once identified, it's treatable with a common antibiotic.
The bottom line
You can't wash your way out of Cyclospora, and the fridge won't save you. Heat kills it. Awareness protects you. Know the risky foods, monitor your state health department during outbreak season (CDC counts it as May 1 through August 31), and if diarrhea lasts more than a few days, ask your doctor to test for it by name.
Download the free handout below to share with clients, patients, or staff.
Sources
CDC, Surveillance of Cyclosporiasis (updated July 10, 2026; case counts as of July 9, 2026)
Cyclospora Outbreak: Case Count Tracker
Last reviewed: July 28, 2026. Figures below carry the date each health department published them.
A source has been named. On July 17, 2026, Taylor Farms recalled iceberg lettuce grown in central Mexico, and FDA and CDC have linked a multistate outbreak to it. The recall covers lettuce sold at retail (including Walmart) and served in restaurants (including Jack in the Box and Taco Bell), distributed to food-service customers across 27 states. As of July 24, 2026 the multistate outbreak spans 9 states (IL, IN, KS, KY, MI, OH, OK, PA, WV). Officials expect confirmed counts to keep climbing for weeks despite the recall, because of the six-week reporting lag.
Note: FDA also announced a second, unrelated Cyclospora outbreak (at least 72 people) on July 23, 2026 whose source is not yet identified.
| Where | Cases | Hospitalized | As of | Source |
|---|---|---|---|---|
| Michigan | 9,680 ▲ from 8,176 | 160 | Jul 28, 2026 (cases); Jul 23 (hosp.) | Michigan MDHHS dashboard |
| New York State | 632 (outbreak; 666 YTD) | Not reported | Jul 22, 2026 (data thru Jul 20) | NYS DOH |
| Ohio (Northwestern OH) | 2,508 | Not reported | Jul 24, 2026 | Toledo-Lucas County Health Dept. (via CIDRAP) |
| Ohio (Lucas County only) | 1,113 | Not reported | Jul 24, 2026 | Toledo-Lucas County Health Dept. (via CIDRAP) |
| National (CDC) | 4,173 lab-confirmed (+7,400 not yet confirmed) | 308 | Jul 24, 2026 (data thru Jul 20) | CDC Cyclosporiasis Surveillance |
Michigan added roughly 1,500 cases this week, including about 475 older cases that arrived through delayed laboratory reporting rather than a single day's surge. Why the totals don't line up: CDC counts only lab-confirmed cases and runs about six weeks behind, while state health departments count confirmed and probable cases and county departments are often ahead of their own state — which is why one state (Michigan) reports more than twice CDC's entire national confirmed total. No deaths have been reported. National figures cover U.S.-acquired cases since May 1, 2026.
This illness can drag on for weeks
Cyclospora is not a 24-hour bug. Without treatment, it typically causes watery diarrhea, cramping, nausea, fatigue, and loss of appetite that can last several weeks — often a month or more — and symptoms may fade and then relapse before the infection clears. That prolonged, relapsing course is why prompt testing matters: the right antibiotics shorten the illness. Anyone with ongoing diarrhea should see a health-care provider and ask specifically about testing for Cyclospora.
What to do right now
Do not eat recalled iceberg lettuce. In affected areas, buy whole heads of lettuce rather than pre-washed bagged or pre-mixed kits, discard the outer two to three layers of leaves, and wash the inner leaves under running water. Cooking greens to an internal temperature of at least 158°F (70°C) is the safest option — the parasite resists chemical disinfection, and washing alone cannot guarantee removal. Anyone with sudden, ongoing watery diarrhea should contact a health-care provider; cyclosporiasis is treatable with antibiotics.
Sources: Michigan MDHHS Infectious Disease Outbreaks dashboard (Jul 28, 2026); New York State DOH Cyclosporiasis page (Jul 22, 2026); Toledo-Lucas County Health Department, reported via CIDRAP (Jul 24, 2026); CDC Surveillance of Cyclosporiasis (Jul 24, 2026); FDA/Taylor Farms recall notice (Jul 17, 2026). Compiled for Food and Health Communications.
