What Cruisers Should Know About Cyclosporiasis Right Now

You may have seen headlines this summer about a multistate outbreak of a stomach bug called cyclosporiasis. If you have a cruise coming up — or you're already dreaming about port-day food — here's what's actually worth knowing, and what isn't.

What it is

Cyclosporiasis is an intestinal infection caused by a microscopic parasite called Cyclospora cayetanensis. It causes watery diarrhea, cramping, nausea, fatigue, and loss of appetite, usually starting about a week after exposure. It's not something you catch from being near a sick person — it spreads through contaminated food or water, almost always fresh produce.

What's happening in 2026

As of mid-July, health officials are tracking an outbreak across roughly 30 U.S. states, with Michigan reporting the largest cluster. The source hasn't been pinned down yet, but it's worth noting: this appears to be a domestic U.S. supply chain issue, not something tied to any particular cruise port or destination. If you're departing from or connecting through one of the more heavily affected states, that's more relevant to your pre-cruise days than anything you'll encounter once you're at sea or in port abroad.

The produce connection

This is really a produce story. Past outbreaks have consistently traced back to:

• Fresh raspberries

• Cilantro and basil

• Snow peas

• Lettuce and bagged salad blends

These items are usually eaten raw, so there's no cooking step to kill the parasite, and thorough washing helps but doesn't fully eliminate the risk — the organism clings tightly to produce surfaces.

What actually protects you

• Cooked produce is safe. Heat above 158°F kills the parasite completely.

• Peel-it-yourself fruit is low risk — think bananas, oranges, avocados.

• Wash fresh produce and herbs under running water; it reduces risk even if it's not a guarantee.

• Hand sanitizer isn't a reliable defense here — this parasite is tougher than typical bacteria or viruses.

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A note for international itineraries

Cyclospora is more established in some tropical and subtropical regions with less robust water treatment — parts of Latin America, the Caribbean, and Southeast Asia, for example. This isn't new or tied to the current U.S. outbreak, but it's a good reminder for shore excursions with street food, salads, or fresh-squeezed juices: when in doubt, cooked and peeled is always the safer bet.

The bottom line

This isn't a reason to cancel a cruise or panic about the buffet. It's a reason to do what good travelers already do — be a little selective about raw produce, especially fresh herbs and pre-cut salads, and see a doctor promptly if you come home with diarrhea that doesn't quit after a few days. Cyclosporiasis is treatable with a short course of antibiotics once it's correctly diagnosed, but it does require a specific stool test, so mention any recent travel to your doctor if symptoms show up.

Questions about how this might affect an upcoming sailing or excursion plans? Reach out — happy to help you think it through.