If you're dreaming of turquoise waters and beachside margaritas in Mexico this summer, we need to talk about something that won't show up in your resort brochure. A parasite called cyclospora is spreading fast among travelers returning from Mexico, and it's causing serious problems.
The numbers are staggering. Since May 2026, roughly 18,000 people across 45 US states have contracted the infection, according to the Centers for Disease Control and Prevention. In the UK, health officials recorded 67 cases between late April and mid-July, with 48 of those involving people who'd just returned from all-inclusive resorts in the Riviera Maya and Cancun. The outbreak has been traced to iceberg lettuce supplied to Taco Bell from a Central Mexican grower, though the problem is spreading beyond any single source.
Here's what makes this particularly unsettling: cyclospora doesn't care about your room rate. Guests staying at high-end resorts are getting infected right alongside everyone else. The parasite sneaks in through contaminated fresh produce, salads, berries, and herbs. When you swallow it, it triggers what doctors delicately call "watery diarrhea" along with stomach cramps, nausea, fatigue, and sometimes fever. Symptoms typically show up around a week after exposure, which means you might be home before things get really ugly.
Why This Matters More Than You'd Think
The good news: cyclospora is rarely fatal and often clears on its own or with antibiotics. Two deaths were reported in Michigan, but both involved people with serious underlying health conditions. Most travelers recover without complications.
The bad news: you could spend two weeks of your hard-earned vacation running to the bathroom instead of exploring. And unlike some travel health scares, understanding the actual risk means taking practical precautions rather than canceling your trip entirely.
How to Stay Safe Without Ruining Your Holiday
Dr. Philip Veal, a travel health consultant with the UK Health Security Agency, offers straightforward guidance. Skip the fresh salads, raw herbs, unpeeled fruit, and soft berries no matter how inviting they look at the resort buffet. Stick to bottled water and thoroughly cooked meals. This isn't about avoiding Mexico entirely, it's about being smart with what you eat and drink.
The parasite isn't spread person-to-person, so you won't catch it from other guests. You catch it by ingesting contaminated food or water. That means your dining choices are your best defense.
- Drink bottled water (even for brushing teeth)
- Choose cooked foods over raw produce
- Avoid unpeeled fruits and fresh salads
- Skip uncooked herbs and garnishes
- Be cautious at all resorts, regardless of star rating
Before you leave home, check with your national travel health authority for the latest recommendations. Health officials continue monitoring outbreaks and updating guidance as situations change, so it's worth doing a quick check before departure.
What Happens If You Get It
If you develop watery diarrhea, appetite loss, weight loss, stomach pain, bloating, nausea, or flu-like symptoms after returning home, see a doctor right away. Tell them you've traveled to Mexico. They can test for cyclospora and prescribe antibiotics if needed. Don't just assume it'll pass on its own, especially if symptoms last more than a few days.
Mexico remains a spectacular destination with incredible food, culture, and natural wonders. This outbreak is a reminder that travel carries real risks, but those risks are manageable when you know what to watch for. Stay informed, make sensible choices about what you eat, and you'll likely have an amazing trip without any unwelcome souvenirs.
