Hantavirus has made global headlines in May 2026 after a deadly outbreak aboard a cruise ship in the Atlantic Ocean left multiple people dead and dozens stranded at sea. But what exactly is hantavirus, how does it spread, and what can you do to protect yourself? Here's everything you need to know about this rare but severe viral disease.
How Hantavirus Unfolded: Inside the 2026 Cruise Ship Outbreak
On May 2, 2026, the World Health Organization (WHO) received reports of a cluster of passengers with severe respiratory illness aboard the MV Hondius, a cruise ship operated by Oceanwide Expeditions. The vessel was sailing in the Atlantic Ocean when the outbreak began. The WHO confirmed that the strain responsible was the Andes virus, a type of hantavirus capable of causing Hantavirus Pulmonary Syndrome (HPS).
According to the CDC, several passengers and crew members fell ill, and at least three deaths have been linked to the outbreak. The ship was eventually anchored near Tenerife in the Canary Islands, where passengers began disembarking on May 10. The CDC has been working closely with the U.S. State Department to bring American passengers home safely. As of the latest reports, no Andes virus cases have been confirmed in the United States as a result of this outbreak, and the overall risk to the American public remains extremely low.
Timeline: How the MV Hondius Outbreak Developed
The outbreak unfolded rapidly over the span of several weeks. Here is a timeline of key events:
- April 2025–November 2025: Across the Americas, eight countries report 229 confirmed hantavirus cases and 59 deaths (CFR of 25.7%).
- Late April 2026: Passengers aboard the MV Hondius begin showing symptoms of severe respiratory illness.
- May 2, 2026: WHO is officially notified of a cluster of respiratory illness cases aboard the cruise ship.
- May 5–8, 2026: WHO confirms the Andes virus strain. CDC activates response protocols and begins coordinating with international partners.
- May 10, 2026: The MV Hondius arrives in Tenerife, Canary Islands. Passengers begin disembarking under medical supervision.
- May 11, 2026: Two more passengers test positive for hantavirus. Evacuation efforts continue.
Understanding Hantavirus: What the Virus Does to the Body
Hantaviruses are a family of viruses carried primarily by rodents. When transmitted to humans, they can cause two distinct types of illness depending on the strain and geographic location.
Hantavirus Pulmonary Syndrome (HPS) is found mainly in the Americas. The most common carrier in the United States is the deer mouse. HPS begins with early symptoms such as fatigue, fever, and muscle aches—especially in the thighs, hips, back, and shoulders. About half of all patients also experience headaches, dizziness, chills, and abdominal problems like nausea, vomiting, and diarrhea. Four to ten days later, late-stage symptoms appear, including coughing and severe shortness of breath as the lungs fill with fluid. HPS is deadly in approximately 38% of cases.
Hemorrhagic Fever with Renal Syndrome (HFRS) is more common in Europe and Asia, caused by strains like Hantaan, Dobrava, Seoul, and Puumala viruses. HFRS primarily affects the kidneys and causes intense headaches, back and abdominal pain, fever, blurred vision, and low blood pressure. The severity and fatality rate vary by strain, ranging from less than 1% for milder strains to up to 15% for severe strains.
How Hantavirus Spreads: Rodents, Airborne Particles, and Rare Person-to-Person Transmission
Hantaviruses are primarily spread from rodents to humans. People usually become infected when they inhale aerosolized particles from fresh rodent urine, droppings, or nesting materials. The virus can also enter the body through broken skin or the eyes, nose, or mouth after contact with contaminated materials. Rodent bites can transmit the virus but this is rare.
The Andes virus—the strain involved in the 2026 cruise ship outbreak—is unique among hantaviruses because it can also spread from person to person. However, this transmission is rare and requires very close contact, including direct physical contact, prolonged time in enclosed spaces, or exposure to an infected person's saliva, respiratory secretions, or other body fluids.
People at higher risk include those who handle or clean up after rodents, such as pest exterminators and animal caretakers. Families with young children, pregnant women, and immunocompromised individuals are advised to avoid contact with pet rodents.
Where Things Stand Now: Latest on Hantavirus Prevention
As of May 2026, there is no specific vaccine or cure for hantavirus. Treatment is supportive and focuses on managing symptoms, providing oxygen therapy, and in severe cases, mechanical ventilation. Early recognition and hospitalization significantly improve outcomes.
The CDC emphasizes that prevention is the best strategy. To reduce the risk of hantavirus infection:
- Seal holes and gaps in homes, garages, and sheds to prevent rodents from entering
- Place traps in and around the home to reduce rodent populations
- Remove potential food sources that might attract rodents
- When cleaning rodent-infested areas, never sweep or vacuum dry droppings—instead, wet the area with disinfectant first, then wipe up
- Wear rubber gloves and a mask when cleaning up after rodents
- Avoid stirring up dust in areas where rodents have been active
What Happens Next: The Road Ahead for Hantavirus Monitoring
Health authorities continue to monitor the MV Hondius situation closely. The CDC is providing technical assistance to international partners and has notified state health departments about U.S. passengers who may have been exposed. The WHO is tracking hantavirus cases globally, noting that reported cases in the Americas doubled in 2025 compared to 2024.
While the current outbreak has raised public awareness, officials stress that the overall risk to travelers remains extremely low. Routine travel can continue as normal. However, the outbreak serves as an important reminder of how zoonotic diseases—illnesses that jump from animals to humans—can emerge in unexpected settings.
Key Takeaways: What to Remember About Hantavirus
- Hantavirus is a rare but severe disease spread mainly by rodents, with a fatality rate of up to 38% for HPS
- The Andes virus strain can also spread through close person-to-person contact
- Early symptoms mimic the flu—fever, muscle aches, fatigue—but can rapidly progress to severe respiratory distress
- There is no vaccine or specific treatment; prevention through rodent control is essential
- The 2026 MV Hondius cruise ship outbreak is a rare event, not a widespread public health threat
