What Is Hantavirus? Symptoms, Transmission, Outbreak Updates, and Prevention Explained

Hantavirus is a rare but potentially deadly viral disease that has recently gained global attention after a multi-country outbreak linked to the MV Hondius cruise ship. Health authorities, including the World Health Organization, confirmed several infections and deaths connected to the outbreak, raising public concern about how hantavirus spreads and whether it poses a global threat.

Although health experts currently assess the risk to the general public as “very low,” the outbreak has sparked important questions about hantavirus symptoms, transmission, treatment, and prevention.

What Is Hantavirus?

Hantaviruses are a group of viruses naturally carried by rodents such as rats and mice. The virus was first identified near the Hantan River in South Korea in 1976, which is where its name originated.

Humans can become infected when they come into contact with infected rodent urine, saliva, droppings, or contaminated dust particles. Once inside the human body, hantaviruses can cause severe illnesses affecting the lungs, heart, or kidneys.

There are two major disease forms caused by hantavirus:

• Hantavirus Pulmonary Syndrome (HPS/HCPS) affecting the lungs and heart
• Hemorrhagic Fever with Renal Syndrome (HFRS) affecting the kidneys

HPS is more common in North and South America, while HFRS is primarily found in Europe and Asia.

What Is the Andes Virus?

The recent cruise ship outbreak has been linked to the Andes virus, a strain of hantavirus mainly found in South America, especially in Argentina and Chile.

What makes the Andes strain unusual is that it is the only known hantavirus capable of limited human-to-human transmission. Most hantaviruses only spread from rodents to humans.

According to health experts, Andes virus transmission between humans generally requires close and prolonged contact, such as:

• Sharing a bed
• Intimate contact
• Prolonged household exposure
• Sharing food or personal spaces

Unlike airborne viruses such as COVID-19 or measles, Andes virus does not spread easily among large groups of people.

How Does Hantavirus Spread?

Hantavirus primarily spreads through exposure to infected rodents and their waste materials.

Common Ways Humans Become Infected

People may catch hantavirus through:

• Breathing in contaminated dust particles
• Touching rodent urine, saliva, or droppings
• Cleaning poorly ventilated rodent-infested areas
• Eating contaminated food
• Rodent bites or scratches (rare)

High-risk activities include:

• Farming
• Forestry work
• Camping in infested areas
• Cleaning barns, cabins, garages, or storage spaces

The virus can become airborne when dried rodent waste is disturbed during sweeping or cleaning.

Can Hantavirus Spread Between Humans?

In most cases, hantavirus does not spread between humans. However, the Andes virus strain has shown limited human-to-human transmission in previous outbreaks.

Experts believe transmission is most likely during the early stages of illness when viral shedding is highest.

The World Health Organization noted that close household members or intimate partners face the highest risk during such outbreaks.

Symptoms of Hantavirus

Symptoms usually appear between 1 to 8 weeks after exposure, depending on the strain.

Early Symptoms

Common early signs include:

• Fever
• Fatigue
• Headache
• Muscle aches
• Chills
• Dizziness
• Nausea
• Vomiting
• Diarrhea
• Abdominal pain

Severe Symptoms

As the illness progresses, patients may develop:

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

In severe cases, patients may require intensive care, oxygen support, or mechanical ventilation.

How Deadly Is Hantavirus?

Hantavirus infections are rare but can be extremely dangerous.

According to global health agencies:

• Fatality rates in Europe and Asia range from 1% to 15%
• Fatality rates in the Americas can reach up to 50%

The severity depends on the virus strain, the patient’s health condition, and how quickly treatment begins.

The recent cruise ship outbreak has already resulted in multiple deaths, highlighting how rapidly the disease can worsen.

The MV Hondius Cruise Ship Outbreak Explained

The recent outbreak aboard the MV Hondius, a Dutch polar expedition cruise ship, became one of the most unusual hantavirus incidents ever reported.

The ship departed from Argentina in April 2026 and traveled through Antarctica and the South Atlantic region before several passengers developed severe respiratory illness.

Reported Cases

According to the World Health Organization:

• Multiple confirmed and suspected cases were identified
• Several passengers developed pneumonia and respiratory distress
• At least three deaths were reported
• Some patients required ICU treatment
• Symptoms appeared between April 6 and April 28

The ship carried passengers and crew from more than 20 nationalities, prompting international coordination among health authorities.

Investigators believe exposure may have occurred in South America before boarding the vessel.

Why Experts Say Public Risk Is Low

Despite headlines surrounding the outbreak, public health officials maintain that the risk to the general population remains very low.

There are several reasons for this:

• Hantavirus infections are relatively uncommon
• Human-to-human transmission is rare
• The Andes strain spreads inefficiently
• Close prolonged contact is usually required
• Most routine travel activities carry minimal risk

The European Centre for Disease Prevention and Control also confirmed that genetic sequencing does not suggest the virus has mutated into a more transmissible variant.

How Is Hantavirus Diagnosed?

Diagnosing hantavirus early can be difficult because symptoms resemble influenza or other respiratory illnesses.

Doctors may use:

• PCR testing
• Blood antibody tests
• ELISA testing
• Imaging scans for lung complications

Patients with suspected rodent exposure and flu-like symptoms are advised to seek medical care immediately.

Is There a Treatment or Vaccine?

Currently, there is no specific antiviral cure or approved vaccine for hantavirus infection.

Treatment mainly focuses on supportive medical care, including:

• Oxygen therapy
• Hydration
• Blood pressure stabilization
• Mechanical ventilation
• Intensive care monitoring
• Dialysis for kidney complications

Early hospitalization significantly improves survival chances.

How to Prevent Hantavirus

Preventing hantavirus mainly involves reducing contact with rodents and contaminated environments.

Prevention Tips

• Seal holes in homes and garages
• Store food securely
• Use rodent traps
• Avoid dry sweeping rodent waste
• Use disinfectants when cleaning
• Wear gloves and masks in infested areas
• Improve ventilation before cleaning enclosed spaces

Health experts recommend wet-cleaning methods instead of sweeping, which can release contaminated particles into the air.

Final Thoughts

The hantavirus outbreak linked to the MV Hondius cruise ship has drawn worldwide attention because of its rare circumstances and the involvement of the Andes virus strain. However, global health agencies continue to emphasize that the overall public risk remains low.

While hantavirus infections are uncommon, they can become severe very quickly. Awareness of symptoms, early medical attention, and proper rodent control remain the most effective ways to reduce risk.

As investigations continue, health officials worldwide are closely monitoring the situation to prevent further spread and better understand the source of exposure.