Everything You Need to Know About Hantavirus

In May 2026, global health authorities began tracking an unusual and alarming outbreak of hantavirus linked to the Dutch expedition cruise ship MV Hondius. What started as a mysterious respiratory illness onboard quickly escalated into an international public health investigation involving the World Health Organization (WHO), the CDC, and multiple governments across Europe, Africa, Asia, and the America.

What Happened on the MV Hondius?

The MV Hondius, operated by Oceanwide Expeditions, departed Ushuaia, Argentina, in April 2026 on a long Antarctic and South Atlantic expedition cruise carrying passengers and crew from more than 20 countries.

A few days into the voyage, several passengers reportedly developed flu-like symptoms. At first, the illnesses did not raise major concern. But by mid-April, one passenger had died onboard. Soon after, additional severe respiratory cases appeared, and more passengers became critically ill.

By early May, at least three deaths had been reported, and several people required intensive medical care. The World Health Organization confirmed a hantavirus cluster linked to the ship. Multiple countries began tracing exposed passengers, quarantine, and isolation procedures

The outbreak involved the Andes virus strain, one of the very few hantaviruses known to occasionally spread from person to person under close contact conditions.

Health authorities repeatedly stressed that the risk to the general public remained low, but the incident drew comparisons to early COVID-era cruise ship outbreaks because of how quickly infections spread in a confined environment.

So, What Exactly Is Hantavirus?

Hantavirus is a group of viruses mainly carried by rodents such as mice and rats. Humans usually become infected after exposure to infected rodent urine, saliva, or droppings.

The virus can enter the body when contaminated dust particles are inhaled — especially in enclosed or poorly ventilated areas.

Different hantavirus strains exist around the world:

• In the Americas, hantaviruses mainly cause Hantavirus Pulmonary Syndrome (HPS), a dangerous lung disease
• In Europe and Asia, they more commonly cause Hemorrhagic Fever with Renal Syndrome (HFRS), which affects the kidneys and blood vessels (

Most hantavirus infections are rare, but when severe disease develops, it can become life-threatening very quickly.

How Does Hantavirus Spread?

The virus spreads mainly through exposure to infected rodents. Common transmission routes include:

• Breathing in virus particles stirred into the air from rodent urine or droppings
• Touching contaminated surfaces and then touching the mouth or nose
• Rodent bites or scratches (rare)
• Handling rodent nests or dead rodents without protection

Most hantaviruses do not spread from person to person. However, the Andes virus, found in South America, has shown limited human-to-human transmission.

People are at greater risk when:

• Cleaning abandoned cabins, sheds, barns, or garages
• Camping or hiking in rodent-infested areas
• Living or working in places with poor rodent control
• Sweeping or vacuuming rodent droppings

Health experts strongly warn against vacuuming or sweeping rodent waste because it can aerosolize infectious particles.

Symptoms of Hantavirus

Symptoms usually appear between 1 and 8 weeks after exposure. Early symptoms often resemble the flu, which can make diagnosis difficult.

Early Symptoms

• Fever
• Fatigue
• Muscle aches
• Headaches
• Chills
• Dizziness
• Nausea and vomiting
• Abdominal pain

Severe Symptoms

As the disease progresses, patients may develop:

• Coughing
• Shortness of breath
• Chest tightness
• Fluid buildup in the lungs
• Kidney failure
• Low blood pressure
• Internal bleeding

In severe lung-related cases, breathing can rapidly become difficult and require emergency medical care.

How Deadly Is It?

Hantavirus is rare, but severe cases can be extremely dangerous.

For Hantavirus Pulmonary Syndrome, fatality rates can approach 30–40%, and some outbreaks have reported even higher mortality rates

The danger comes from how rapidly breathing problems can develop once the lungs become affected.

Is There a Cure?

Currently there is no specific antiviral cure, and no widely available vaccine

Treatment mainly involves supportive hospital care like, oxygen therapy, ventilators, IV fluids, blood pressure stabilization, and intensive monitoring. However, early treatment significantly improves survival chances.

How to Protect Yourself

Fortunately, hantavirus is preventable in most cases.

Rodent Prevention Tips

• Seal holes and gaps in homes
• Store food in sealed containers
• Remove clutter where rodents may nest
• Use traps if rodents are present
• Keep kitchens and storage areas clean

Safe Cleanup Guidelines

If you find rodent droppings:

1. Ventilate the area for at least 30 minutes
2. Wear gloves and ideally an N95 mask
3. Spray droppings with disinfectant or bleach solution
4. Wipe with paper towels
5. Dispose of waste in sealed bags

Do not sweep or vacuum droppings.

Should People Be Worried?

Experts say the general public should stay informed but not panic.

The MV Hondius outbreak gained attention because it involved a rare transmissible hantavirus strain, happened in a confined cruise ship setting, and spread internationally before detection.

But health agencies including WHO, CDC, ECDC, and Africa CDC continue to emphasize that widespread community transmission remains unlikely.