Cyclospora Is Tearing Through 30+ States. Here's the Question Nobody Is Asking.
- LeNae Goolsby
- Jul 14
- 7 min read
Right now, thousands of Americans are having a very bad week.
A parasite called Cyclospora cayetanensis has triggered one of the largest cyclosporiasis outbreaks in recent U.S. history. State health departments have tallied more than 4,000 cases. The CDC has confirmed hundreds across 31 states, with dozens of hospitalizations. Michigan alone has reported thousands of cases since late June. Investigators are looking hard at lettuce and pre-packaged salad greens as the likely vehicle.
The headlines are doing what headlines do: symptoms, states, a map, a scary word. "Explosive diarrhea" is getting a lot of airtime.
But here is the question almost nobody is asking, and it is the one that actually matters: four people eat the same salad. One is hospitalized. Two are miserable for three weeks. One barely notices. Why?
That question is the entire difference between reactive medicine and root-cause medicine. Let's take both halves seriously.
First, the Facts: What Cyclospora Actually Is
Cyclospora cayetanensis is a single-celled parasite that infects the small intestine. You get it by swallowing food or water contaminated with feces containing the parasite. In the United States, it almost always arrives on fresh produce: leafy greens, herbs like cilantro and basil, berries, and snap peas.
Three details make it uniquely annoying, and they are worth understanding:
It is not contagious person-to-person. When Cyclospora is shed in stool, it isn't yet infectious. It needs days to weeks in the environment to mature. So you cannot catch it from a sick coworker — you catch it from the food supply.
Washing your produce will not reliably save you. Cyclospora is resistant to routine chlorine and standard produce sanitizers. Rinsing helps with dirt. It is not a guarantee against this parasite.
It hides from routine testing. Cyclospora is not reliably picked up by a standard ova-and-parasite exam. It requires specific testing — a molecular GI panel or specialized staining. If your physician doesn't think to ask for it, the lab will not go looking for it.
That last point is why so many people walk out of urgent care with a shrug and a diagnosis of "probably a stomach bug," then spend the next month wondering why they still can't be more than ninety seconds from a bathroom.
The Symptoms: Why This One Drags On
Incubation is typically about a week — anywhere from two days to two weeks after exposure. Then it hits:
Watery, frequent, sometimes explosive diarrhea
Abdominal cramping, bloating, and gas
Nausea, and sometimes vomiting
Profound fatigue and loss of appetite
Unintentional weight loss
Low-grade fever
The hallmark that separates cyclosporiasis from an ordinary 48-hour stomach bug is its relapsing pattern. You feel better. You think you're through it. Then it comes roaring back. Untreated, this cycle can run for weeks to more than a month.
Treatment is straightforward when it's correctly identified: trimethoprim-sulfamethoxazole (Bactrim) is the CDC's first-line therapy, typically for seven to ten days, alongside aggressive fluid and electrolyte replacement. If you are sulfa-allergic, alternatives exist but are more limited — talk to your physician.
If you have watery diarrhea that keeps relapsing, especially after eating fresh greens, do not tough it out. Get tested, and specifically ask whether Cyclospora was included in the panel.
Now the Real Question: Why Do Some People Get Destroyed and Others Don't?
Here is where conventional medicine stops and where we start.
Exposure is not destiny. Whether a pathogen takes hold, how hard it hits you, and how fast you recover are all functions of what we call terrain — the condition of the host. And terrain is not luck. It is largely built.
1. Your stomach acid is the first gate
Stomach acid is a chemical kill zone. Suppress it, and you weaken your single most underrated defense against swallowed pathogens. This is well established for enteric bacterial infections, and it's a real concern for anyone on long-term acid-blocking medication. Millions of Americans over 40 are on a proton-pump inhibitor they started years ago and have never revisited. That is a defense you have quietly disarmed.
2. Your gut barrier decides what gets through
The lining of your small intestine is a single cell thick — a wall between the outside world and your bloodstream. When that barrier is compromised (what gets called intestinal permeability, or "leaky gut"), infections aren't just more likely to gain a foothold — the downstream inflammatory consequences are worse and last longer.
3. Your microbiome is a standing army
A diverse, well-fed community of commensal bacteria competes with invaders for space, fuel, and attachment sites, and produces compounds that make the gut hostile to pathogens. A microbiome flattened by years of processed food, low fiber, chronic stress, and repeated rounds of antibiotics is an army at half strength — with no one guarding the gate.
4. Your mucosal immunity is the local security detail
Secretory IgA is the antibody that patrols your gut lining and neutralizes pathogens before they can attach. Chronic stress, elevated cortisol, poor sleep, and nutrient deficiencies — zinc and vitamin D chief among them — all suppress it. Most high-achieving adults over 40 are running with all four of those working against them.
5. Your metabolic health sets the baseline
Insulin resistance, visceral fat, and chronic low-grade inflammation impair immune response across the board. A body that is already inflamed does not respond to an acute insult efficiently. It overreacts, then struggles to shut the response down.
So when four people eat the same contaminated salad, and only one ends up in the hospital, it isn't random. It's a report card.
The Part Nobody Warns You About: When the Parasite Is Gone, and You're Still Not Better
This is the piece we see constantly at Infinite Health, and it's the part that gets ignored.
The course of Bactrim ends. Repeat testing is clean. The parasite is gone. And you are still bloated. Still exhausted. Still reacting to foods you ate your whole life without a problem. Still living within sprinting distance of a bathroom.
This has a name: post-infectious IBS. A meaningful percentage of people who go through infectious gastroenteritis develop persistent gut dysfunction afterward. The infection is the match. The lingering dysfunction is the fire it left behind:
The microbiome has been hit twice — first by the parasite, then by the antibiotic that killed it
The intestinal lining has been damaged and needs to be actively rebuilt
Digestive enzyme output drops, so food isn't broken down properly
Nutrients — iron, B12, magnesium, fat-soluble vitamins — have been poorly absorbed for weeks
Gut motility and the gut-brain signaling axis have been dysregulated
You will typically be told this is normal and to give it time. Sometimes that is true. Often it is not, and "give it time" turns into two years of quietly diminished energy, cognition, and quality of life — because nobody ever closed the loop.
What Root-Cause Medicine Actually Does Here
To be clear and precise: acute cyclosporiasis is an infection, and it is treated with the appropriate antimicrobial. That is not controversial, and it is not where we're trying to be clever.
Where integrative and functional medicine earns its keep is on either side of that prescription — the terrain that determined how hard you got hit, and the repair that determines whether you fully return to baseline.
At Infinite Health IMC, that means doing the work most practices skip:
Comprehensive testing — not a five-marker screen. Advanced stool analysis, inflammatory markers, nutrient status, and metabolic panels that reveal what your gut and immune system are actually doing.
Rebuilding the barrier — targeted nutrition and therapeutic support for the intestinal lining, rather than assuming it heals on its own.
Restoring the microbiome after antibiotics, rather than leaving a scorched field and hoping something good grows back.
Correcting the deficiencies — the zinc, vitamin D, magnesium, and B-vitamin gaps that were quietly suppressing your immune defenses long before you ever ate that salad.
Addressing the metabolic and hormonal drivers of chronic inflammation, so the next insult — parasite, virus, or surgery — lands on a body that can actually handle it.
This is the same principle that governs everything we do, whether the presenting problem is a bad knee, flatlined hormones, or a parasite from a bag of lettuce: treat the terrain, not just the trespasser.
Practical Prevention — Starting Today
Take fresh produce seriously during an active outbreak. Cooking kills Cyclospora. Rinsing does not reliably kill it. During a live outbreak, that math matters.
Follow official recalls and advisories from the CDC and your state health department, and act on them the day they're issued — not the week after.
If you develop relapsing watery diarrhea, get tested and ask specifically about Cyclospora. Do not let it be waved off as a stomach bug.
Stop assuming your immune system is fine because you haven't been sick lately. Absence of symptoms is not evidence of resilience — it's evidence you haven't been tested yet.
The Bottom Line
This outbreak will end. The recall will be issued, the contaminated crop will be pulled, and the news cycle will move on.
Your gut, on the other hand, is still yours. And it will be there for the next exposure, and the one after that.
The people who sail through these events are not lucky. They are, almost without exception, the people who did the work before it mattered. That is not a marketing line. It is a description of how immunity works.
Ready to Find Out What Your Terrain Actually Looks Like?
If this outbreak knocked you flat — or if you're still not right weeks after a gut infection — that is information worth acting on.
Infinite Health IMC is an integrative and functional medicine practice serving the Greater New Orleans area, led by Trip Goolsby, MD. We specialize in finding and correcting the root causes of chronic inflammation, gut dysfunction, hormone imbalance, and metabolic decline in high-performing adults over 40.
Book a free discovery call with a member of our wellness coordinator team. We'll talk through what you're experiencing and whether our approach is the right fit for you.
Call (504) 323-0025
Infinite Health IMC | 3900 Veterans Memorial Blvd, Suite 204, Metairie, LA 70002
Medical Disclaimer
This article is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Cyclosporiasis is a reportable infectious disease requiring evaluation by a licensed healthcare provider. If you are experiencing severe or persistent diarrhea, dehydration, or fever, seek medical care promptly. Infinite Health IMC does not diagnose or treat acute parasitic infection in place of appropriate antimicrobial therapy. Individual results vary.
Sources
CDC — About Cyclosporiasis; Clinical Care of Cyclosporiasis; Surveillance of Cyclosporiasis (cdc.gov/cyclosporiasis). Case counts as of July 2026 per CDC and state health department reporting (NPR, CNN, NBC News tallies, Michigan MDHHS).
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