The last Americans held at the Nebraska quarantine unit after exposure to the MV Hondius hantavirus outbreak have been released. Here is the complete story — and what Andes virus actually is.
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Infectious Diseases in Focus →On June 21, 2026 at 2:00 PM CST, the last eight Americans held at the National Quarantine Unit at the University of Nebraska Medical Center walked out of the facility and went home. Their 42-day monitoring period — the longest of its kind in recent U.S. public health history — had ended. The result: not a single one of the 18 Americans quarantined in Omaha developed hantavirus disease.
The U.S. Department of Health and Human Services confirmed the outcome the same day. "Through close collaboration among federal, state, and local partners, HHS helped protect the American people, contain potential risks, and bring this response effort to a successful conclusion," spokesperson Emily Hilliard said in a statement.
For those who followed this story since April — and for those encountering it for the first time — here is the complete picture: what happened on the MV Hondius, why the quarantine lasted 42 days, what Andes virus actually is, and what the public health response got right.
The MV Hondius is a Dutch-flagged expedition cruise ship operated by Oceanwide Expeditions, designed for voyages to remote and extreme destinations. On April 1, 2026, it departed from Ushuaia, Argentina with 114 passengers and 61 crew from 23 countries, bound for Antarctica and several isolated South Atlantic islands.
The passengers were, by any measure, an adventurous and well-traveled group. Berths on the ship ranged from €14,000 to €22,000. Most came from Spain, France, the United Kingdom, and the United States. What none of them could have anticipated was that the voyage would end not in Rotterdam — the planned final port — but in a quarantine facility in the American Midwest.
The working hypothesis — based on epidemiological investigation — is that the first case acquired infection on land in South America before boarding the ship. The exact source remains under investigation; exposure in Chile was initially considered but has since been largely ruled out based on incubation period analysis. The most likely scenario is exposure in Argentina in the days before departure from Ushuaia.
Once aboard the ship, person-to-person transmission occurred — the precise mechanism of which remains under study. WHO has stated that transmission may have included close contact with infected individuals, contact with contaminated surfaces, and possibly direct deposition of infectious respiratory particles onto facial mucous membranes. The virus does not appear to have the airborne transmission dynamics of measles or COVID-19.
The standard incubation period for hantavirus pulmonary syndrome is 1 to 8 weeks after exposure. However, in previous outbreaks involving Andes virus specifically, symptoms have been documented to appear as late as 42 days post-exposure. This represents the outer boundary of the known incubation window.
For a disease with a case fatality rate of approximately 38% in severe cases, and for which no specific treatment exists, public health authorities determined that monitoring through the full 42-day window was medically justified — particularly given the unusual person-to-person transmission dynamics of Andes virus.
Behind the epidemiological data is a remarkably human story. Jake Rosmarin, one of the six passengers who remained at UNMC through the full quarantine period, described the experience with striking candor.
"Three weeks into the trip, I called my fiancé crying that five weeks away from each other is too long," he said after his release. "And five weeks turned into twelve. Twelve weeks is a long time to be away from home. I mean, that's a quarter of the year."
The quarantine generated its own community. Local restaurants in Omaha delivered food. Schools sent cards. Omaha Steaks hosted a cookout in the parking lot. Online support arrived from strangers. Dr. Michael Wadman, chair of the National Quarantine Unit, reflected that the experience demonstrated not just the capacity of the facility but something about the people of Nebraska: "The people in Nebraska also stepped up."
Not all experiences were positive. One passenger — a Florida resident — was held under a formal quarantine order after Florida officials declined a federal request to provide round-the-clock surveillance if she returned home. She described the six-week forced quarantine as "a political stunt," noting that by the final weeks, no one expected further cases to emerge.
| Feature | Andes Virus (ANDV) | Most Other Hantaviruses |
|---|---|---|
| Primary transmission | Rodents (and person-to-person, rare) | Rodents only |
| Person-to-person spread | Yes — rare, close contact only | No |
| Geographic range | South America (Argentina, Chile) | Various — global |
| Clinical syndrome | Hantavirus Pulmonary Syndrome | HPS or HFRS (kidney) |
| Case fatality rate (severe) | ~38% | ~38% (HPS) / 1–15% (HFRS) |
| Vaccine | None approved | One approved (China, HFRS) |
| Incubation period | 4–42 days | 1–8 weeks |
| ECMO benefit in severe cases | Survival up to ~80% | Similar |