A hantavirus outbreak tied to the MV Hondius cruise ship has reached 11 total reported cases, including three deaths, prompting federal health officials to quarantine Americans who traveled on the vessel in facilities across Nebraska and Georgia while maintaining strict protocols on a virus with a lengthy incubation period.
Eighteen American citizens, including one British dual national, disembarked the ship off Tenerife, Spain, 3 days ago before returning to the United States. Most were transported to the University of Nebraska Medical Center, with 15 people staying in standard quarantine units and one in the center's biocontainment unit. Two additional passengers, a couple, were taken to a biocontainment unit at Emory University in Atlanta. The Centers for Disease Control and Prevention confirmed that the two were moved to preserve space at the Nebraska biocontainment unit.
Quarantine Status and Testing
All Americans in quarantine at the University of Nebraska were asymptomatic as of 1 day ago, according to the Department of Health and Human Services. One of the two passengers sent to Atlanta was initially symptomatic but tested negative for the Andes variant as of 1 day ago. HHS also reported that one American passenger initially tested "mildly" positive for hantavirus after evacuating the ship, though Spain's Ministry of Health said today that the American with an "inconclusive" test had now tested negative.
Dr. Stephen Kornfeld, an American passenger on the MV Hondius, identified himself as the individual with the "mildly" positive test result. Kornfeld stated he stepped in as the ship's doctor in April before eventually starting to experience symptoms himself. He recovered, but was tested alongside other ship staff in early May. When two passengers were evacuated to the Netherlands, one of Kornfeld's test samples was also sent to two labs, which turned up different results. "One lab was negative and one lab was faintly positive, so I was told the test was intermediate, but I think since it wasn't a negative, it's sort of being looked at as a potential positive," Kornfeld said. He is currently quarantining in the Nebraska biocontainment unit.
The CDC said Americans who traveled on the ship are encouraged to stay quarantining in Nebraska, but stopped short of saying they would be kept at the facility for the full 42-day incubation period. A CDC official stated, "Our goal is to continue to work with them to the best possible place for them, and we encourage them to be there." Regarding transparency, the official added, "At this time, we're not putting out exact numbers. Again, we want to ensure that we are protecting and respect the privacy of all the individuals."
International Cases and Critical Condition
A French woman who was in intensive care is now on lung support, according to multiple reports. French Health Minister Stéphanie Rist said the woman, infected with Andes virus, was one of five French nationals repatriated from the ship. The woman is being treated with an artificial lung, with Dr. Xavier Lescure, an infectious disease specialist at Bichat Hospital, noting the passenger has a severe form of the disease that has caused life-threatening lung and heart problems. The life-support device pumps blood through an artificial lung, providing it with oxygen and returning it to the body, hoped to relieve enough pressure on the lungs and heart to give them time to recover. Lescure called it "the final stage of supportive care."
The World Health Organization confirmed that confirmed and suspected cases have only been reported among the cruise ship's passengers or crew. WHO Director-General Tedros Adhanom Ghebreyesus said, "At the moment, there is no sign that we are seeing the start of a larger outbreak. But of course the situation could change, and given the long incubation period of the virus, it's possible we might see more cases in the coming weeks." He also noted that the latest person confirmed to be infected is a Spanish passenger who tested positive after being evacuated from the ship and was in quarantine at a military hospital in Madrid.
Health authorities confirmed this was the first hantavirus outbreak on a cruise ship. The MV Hondius is sailing back to the Netherlands, where it will be cleaned and disinfected. A total of 87 passengers and 35 crew were escorted from the ship to shore in Tenerife by personnel in full-body protective gear and breathing masks in an effort that ended Monday night. Two aircraft carried Dutch nationals as well as passengers from Australia and New Zealand and crew members from the Philippines to quarantine in the Netherlands, according to the Dutch government.
Virus Transmission and Investigation
Hantavirus usually spreads from rodent droppings and is not easily transmitted between people, but the Andes virus detected in the cruise ship outbreak may be able to spread between people in rare cases. Symptoms can include fever, chills and muscle aches and usually show between one and eight weeks after exposure. WHO chief Tedros advised that returning passengers should stay in quarantine, either in their homes or in other facilities, for 42 days, and noted that WHO cannot enforce its guidance and that different countries may handle the monitoring of passengers without symptoms in different ways.
Argentina's health ministry said a team of scientific experts will be dispatched in the coming days to investigate the origin of the outbreak. Argentine officials said the Dutch couple identified by the WHO as the first cruise passengers infected with hantavirus spent several months in Argentina and neighboring South American countries before boarding the cruise ship. The couple later died. Argentine officials said the couple took a bird-watching tour that included a stop at a garbage dump where they may have been exposed to rodents carrying the infection. The health ministry said its team will investigate the landfill and other locations the couple visited where rats known to carry the virus are found, although local officials in the province where the cruise departed have challenged the theory it began there.
The Illinois Department of Public Health said it is investigating a potential case of hantavirus in an Illinois resident not linked to the cruise ship outbreak. The CDC is conducting additional testing to confirm the resident is positive for hantavirus, and the health department said it is believed the individual acquired the virus while cleaning a home where rodent droppings were present. CDC staff told IDPH that a confirmatory test result could take up to 10 days.
The CDC has over 100 staff members actively working on the outbreak. Officials said the hantavirus risk to the general public remains low.
Why This Matters:
This outbreak presents significant questions about government coordination, resource allocation, and the limits of quarantine protocols in containing emerging infectious diseases. The decision to distribute quarantined passengers across multiple states rather than maintaining centralized control raises operational efficiency concerns and complicates federal oversight. The CDC's reluctance to commit to a full 42-day quarantine period—despite WHO guidance recommending exactly that duration—reflects tension between public health protocols and practical governance constraints. The involvement of multiple nations, different quarantine standards, and ongoing investigative efforts underscores how disease containment depends on institutional capacity and cross-border cooperation. With 11 cases, three deaths, and the possibility of additional cases emerging over weeks due to the virus's long incubation period, the outbreak demonstrates both the effectiveness of existing public health infrastructure and the unpredictability of novel viral threats in an interconnected world.