A rare hantavirus outbreak aboard the MV Hondius, a Dutch expedition cruise ship sailing in the South Atlantic, has made international headlines — and left many cruise travelers wondering whether to rethink their summer plans. The short answer from infectious disease experts is clear: no, you should not cancel your cruise. But understanding why requires a closer look at what actually happened, what hantavirus is, and how this outbreak differs fundamentally from anything most cruise passengers will ever encounter.
Vessel: MV Hondius — a small Dutch expedition cruise ship
Route: South Atlantic expedition cruise departing from Argentina
Virus: Andes hantavirus — the only known hantavirus strain with human-to-human transmission potential
Cases as of May 13, 2026: 11 total cases linked to the outbreak
Deaths: 3 confirmed
U.S. impact: No confirmed U.S. cases; CDC monitoring 41 people for symptoms
Contents
What Experts Are Actually Saying About Cruise Risk
The clearest and most reassuring statement came from Dr. Jorge Salinas, medical director of infection prevention at Stanford Health Care, who was direct in his assessment this week: “If you’re going on a plane or a cruise this summer, I would say your risk of getting hantavirus is very close to zero.”
That view is shared across the infectious disease community. Dr. Gonzalo Bearman, an infectious disease expert at VCU Health, went further, saying it is “extremely unlikely” that other cruise ships will experience similar outbreaks. “The risk of a wider cruise ship-related outbreak of hantavirus is extremely low. Hantavirus outbreaks in Caribbean cruises or even Mediterranean cruises are extremely unlikely,” Bearman said.
Former CDC Director Dr. Robert Redfield, who worked closely with public health officials during the COVID-19 pandemic, also weighed in: “We have a lot of experience here, and I’m pretty confident that the CDC and public health community have got the right response.” Redfield has described the current outbreak as a likely “dead end” that will be contained within days.
— U.S. Department of Health and Human Services, May 10, 2026
Why This Outbreak Is Nothing Like COVID-19
The hantavirus headlines have inevitably triggered comparisons to the early days of COVID-19, when cruise ships became symbols of the pandemic’s rapid spread. But infectious disease experts are unanimous that the two situations are fundamentally different — and that drawing that comparison does more to generate anxiety than inform travelers.
• Highly contagious — spread through the air via respiratory droplets
• Novel virus with no prior immunity or established treatment protocols
• Spread efficiently in enclosed, ventilated spaces like ship cabins
• Could infect hundreds on a single voyage
• Short incubation (2–14 days) enabled rapid spread before detection
• Confirmed human-to-human transmission the primary spread mechanism
• Not easily spread between people — requires close, sustained contact
• Well-understood virus with decades of research behind it
• Typically requires direct rodent contact for infection
• Only 11 cases on a 147-person ship after weeks at sea
• Long incubation (up to 42 days) means spread is slow and traceable
• Only one of 20–30 hantavirus strains has any H2H transmission potential
“Hantavirus is also not new, meaning doctors and public health officials understand how it spreads far better than they did when COVID-19 emerged in 2020,” noted infectious disease epidemiologist Dr. Mary Jo Trepka of Florida International University. That institutional knowledge means the public health response to this outbreak is drawing on decades of established protocols — not improvising in real time as was necessary in early 2020.
Hantavirus vs. COVID-19: Key Differences at a Glance
While hantavirus has a significantly higher case fatality rate than COVID-19, its extremely limited transmissibility means the overall public health risk is in a completely different category. The chart below compares key metrics across both viruses to illustrate why the outbreak comparison breaks down quickly.
How Did Hantavirus End Up on a Cruise Ship?
Understanding how this specific outbreak happened is the key to understanding why it’s unlikely to happen on your cruise. Dr. Mary Jo Trepka explained it clearly: “I think this is a very special situation that occurred. A person was traveling and exposed to this relatively rare virus, most likely through rodents, and then they just happened to bring it onto the ship.”
The MV Hondius is a small expedition ship — not a mainstream cruise vessel. It was operating in the South Atlantic and had departed from Argentina, the primary geographic range of the Andes hantavirus. The ship’s passengers were engaging in expedition activities including wildlife watching on remote islands, some of which have significant rodent populations. The initial patient is believed to have been infected before boarding — most likely through rodent contact during pre-cruise travel in Argentina.
This is an entirely different risk profile from a Caribbean, Mediterranean, Alaska, or mainstream ocean cruise. Those itineraries do not pass through Andes hantavirus territory, do not involve expedition-style wildlife activities in remote South American wilderness, and are not departing from Argentina or Chile — the only regions where this specific strain is endemic.
Hantavirus in the U.S.: 30 Years of Data in Context
Between 1993 and 2023, the CDC recorded just 890 laboratory-confirmed hantavirus cases across the entire United States — an average of fewer than 30 cases per year across a country of 330 million people. This is an extraordinarily rare disease by any measure. The chart below puts the annual case burden in historical perspective.
