What Is Hantavirus? Symptoms, Spread, and Latest Outbreak Updates

A recent outbreak of Hantavirus linked to the expedition cruise ship MV Hondius has triggered international health alerts and renewed global attention toward rodent-borne diseases. The outbreak, believed to have originated in Patagonia, Argentina, involved multiple severe infections and several deaths, prompting responses from global health agencies.

Unlike many previous hantavirus cases that remained localized, this outbreak became an international concern after infected passengers traveled across multiple countries during a maritime expedition. Many Countries feared to spreading this virus in their own country.

What Happened Recently ?

The MV Hondius Cruise Ship Outbreak

An outbreak of hantavirus was identified on the cruise ship MV Hondius in April 2026, anchored off the coast of Praia, Cape Verde. As of May 5, 2026, seven cases of the acute respiratory virus had been identified, including three deaths.

The outbreak gained global attention after several passengers aboard the Dutch expedition vessel MV Hondius developed severe respiratory illness during a voyage across the South Atlantic in April 2026.

Health investigations later connected the infections to the Andes virus (ANDV) strain of hantavirus, which is mainly found in South America. Authorities believe the first exposure likely occurred in Argentina’s Patagonian region before passengers boarded the ship.

Several passengers and crew members later developed symptoms including:

• fever
• fatigue
• breathing difficulty
• pneumonia-like illness

Some patients required intensive care treatment, while multiple fatalities were reported during the voyage and after medical evacuation.

The situation became especially concerning because the Andes strain is one of the only hantaviruses known to occasionally spread between humans through close contact.

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What Is Hantavirus?

Hantavirus is a rare but potentially deadly rodent-borne disease that can cause severe respiratory or kidney complications in humans. Certain strains have mortality rates ranging between 35% and 50%. The virus usually spreads through contact with infected rodent urine, saliva, or droppings, although human-to-human transmission remains extremely uncommon.

Key Details about Hantavirus

1. Disease Type: In the Americas, hantaviruses mainly cause Hantavirus Pulmonary Syndrome (HPS). In Europe and Asia, they are associated with Hemorrhagic Fever with Renal Syndrome (HFRS).
2. Transmission: Primary Transmission (Rodent-to-Human) and Secondary Transmission (Human-to-Human) – Andes Strain Only.
3. Incubation Period: Symptoms generally appear 1–6 weeks after exposure.
4. Treatment: There is no specific cure, making early intensive care crucial for survival.
5. Prevention: Avoid cleaning rodent-infested areas without proper protection, and avoid sweeping/vacuuming droppings, which stirs up the virus.

Symptoms of Hantavirus Infection

There are mainly four phase shows symptoms of Hantavirus, Symptoms often appear between one and eight weeks after exposure.

Early Phase Symptoms (Prodromal Stage)
Symptoms of HPS usually start to show 1 to 8 weeks after contact with an infected rodent. Early symptoms include: fever, headache, muscle aches (especially in large muscle groups like thighs, hips, back), muscle aches, nausea, and fatigue.

About half of all people infected also experience headaches, dizziness, chills, and abdominal problems such as nausea, vomiting, diarrhea, and abdominal pain.

Progressive Phase Symptoms (4-10 Days After Onset)
Four to 10 days after the initial phase of illness, the late symptoms of HPS appear. These symptoms include coughing and shortness of breath. Patients might experience tightness in the chest, as the lungs fill with fluid.

Critical Phase Complications
Illness onset occurred between 6 and 28 April 2026 and was characterized by fever, gastrointestinal symptoms, rapid progression to pneumonia, acute respiratory distress syndrome and shock.
Someone with a New World hantavirus can rapidly fall into pulmonary or heart failure within a matter of days after initial symptoms appear.

Clinical Mimicry Alert
Early symptoms such as fever, headache, muscle aches, nausea, and fatigue are easily confused with influenza.

How Does Hantavirus Spread?

There are two ways of spreading the Hantavirus disease:

Primary Transmission (Rodent-to-Human)
Hantaviruses are a group of viruses carried by rodents that can cause severe disease in humans. People usually get infected through contact with infected rodents or their urine, droppings or saliva. Infection with hantaviruses can result in a range of illnesses, including severe disease and death.

People get hantavirus from contact with rodents like rats and mice, especially when exposed to their urine, droppings, and saliva. It can also spread through a bite or scratch by a rodent, but this is rare.

In Argentina, the Andes virus is carried by long-tailed pygmy rice rats, which are common in agricultural areas and can live around houses.

Secondary Transmission (Human-to-Human) – Andes Strain Only

To date, human-to-human transmission has been documented only for Andes virus in the Americas and remains uncommon. When it occurs, transmission between people has been associated with close and prolonged contact, particularly among household members or intimate partners, and appears most likely during the early phase of illness, when the virus is more transmissible.

The Argentinian Health Ministry reported that it has recorded 101 hantavirus infections since June 2025, about twice the caseload recorded over the same period last year, with the mortality rate nearly tripling to about one-third of cases.

On Tuesday, the mountain resort town of Bariloche, Patagonia’s most common northern entry point, recorded its first human hantavirus case of 2026.

How to Prevent Hantavirus?

Rodent Control (Primary Strategy)
Eliminate or minimize contact with rodents in your home, workplace, or campsite to reduce your risk of exposure to hantaviruses. Seal holes and gaps in your home or garage to keep rodents from entering these spaces. Place traps in and around your home to decrease rodent infestation. Clean up any easy-to-get food that might attract rodents.

Safe Cleanup Procedures
If cleaning up rodent droppings, use gloves, spray the waste with a bleach solution and wait for five minutes, before wiping the area with paper towels and disposing of them safely.

“Never sweep up or vacuum mouse droppings, since this can spread particles up into the air,” advised public health officials.

Personal Protection Equipment (PPE)
When cleaning up living spaces after a rodent infestation, it is important to wear gloves, use an N95 respirator, open windows and rely on disinfectants.
Hantavirus disease is not same as Covid 19, but still always use best protective gears like in Covid times.

Healthcare Prevention Measures
In healthcare environments, standard precautions should be applied for all patients, including hand hygiene, environmental cleaning and safe handling of blood and body fluids. For suspected or confirmed hantavirus infection, use of standard precautions combined with transmission-based precautions during provision of care is advised.

Outbreak-Specific Measures
During outbreaks or when cases are suspected, early identification and isolation of cases, monitoring of close contacts, and application of standard infection prevention measures are important to limit further spread.

Available evidence indicates that the risk of health-care associated transmission of hantavirus, including Andes virus, is very low when appropriate infection prevention and control measures are applied.

What Is the Impact on India Of Hantavirus?

At present, there is no major hantavirus outbreak reported in India. The immediate risk to the Indian public remains low.

But India may strengthen monitoring of international travelers, ports, airports and zoonotic disease outbreaks. Urban overcrowding and poor sanitation in some regions can increase the risk of rodent-borne diseases. Although hantavirus cases in India are rare, public awareness regarding rodent exposure remains important.

Travel Advisory Monitoring

Indian travelers visiting South America or outbreak regions may need to follow updated health advisories issued by authorities.

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Conclusion

The 2026 hantavirus outbreak connected to the MV Hondius expedition has become one of the most closely watched zoonotic disease events of recent years. While the virus does not currently pose a pandemic-level threat like COVID-19, the outbreak demonstrates how climate change, wildlife exposure, and global travel can rapidly transform local infections into international public health concerns.

For now, health authorities continue to monitor exposed passengers while researchers investigate the precise transmission chain behind the outbreak. The event serves as another reminder that global health security increasingly depends on early detection, scientific cooperation, and public awareness.