A rare and deadly hantavirus outbreak has shocked the global health community after three people died aboard a cruise ship sailing across the Atlantic Ocean. The World Health Organization (WHO) has launched an urgent investigation, raising renewed concerns about this rodent-borne virus that most of the public knows little about. Here is everything you need to know — from the breaking news to the symptoms, treatment, and how to protect yourself.
Breaking: WHO Investigating Hantavirus Outbreak on MV Hondius
A suspected outbreak of the rare hantavirus infection on a cruise ship in the Atlantic Ocean has killed three people and sickened at least three others, the World Health Organization and South Africa’s Department of Health announced on Sunday. WHO confirmed it is working with national authorities and the ship’s operators to conduct a full public health risk assessment.
In a formal statement, the organization said that detailed investigations are ongoing, including further laboratory testing, epidemiological investigations, and sequencing of the virus. Medical care and support are being provided to all passengers and crew members onboard.
The outbreak happened on the MV Hondius, a Dutch-flagged polar expedition cruise ship that had departed Argentina around three weeks earlier for a voyage that included visits to Antarctica, the Falkland Islands, and other stops en route to Spain’s Canary Islands. By Sunday night, the vessel was docked in Praia, the capital of Cape Verde, a country off the west coast of Africa.
The Victims: What We Know
The first victim was a 70-year-old man who died aboard the ship. His body was removed at Saint Helena, a British territory in the South Atlantic. His 69-year-old wife fell ill shortly after and was evacuated to South Africa, where she died at a Johannesburg hospital. A third passenger — a British national — fell ill near Ascension Island and was transferred to South Africa, where they remain in intensive care.
In total, WHO has confirmed at least one case of hantavirus, with five others suspected. Of the six affected individuals, three have died, one is in intensive care, and WHO is working to evacuate two additional passengers still showing symptoms.
Passengers and Contact Tracing
Approximately 150 tourists were aboard the MV Hondius at the time of the outbreak, along with around 70 crew members. South Africa’s National Institute for Communicable Diseases has launched contact tracing in the Johannesburg region to identify anyone else who may have been exposed to infected passengers while they were in South Africa.
Can Hantavirus Spread Between People?
This is one of the most pressing public health questions surrounding the outbreak. While hantavirus is not typically considered a person-to-person disease, WHO has acknowledged that in rare cases transmission between humans is possible. The Andes virus — a strain found in South America, the origin region of this cruise — is the most documented strain known to spread from person to person. This detail is considered highly significant by investigators given the voyage’s South American starting point.
What Is Hantavirus?
Hantaviruses are a family of viruses carried by certain rodents — particularly rats and mice — found throughout the world. People become infected primarily through contact with the urine, droppings, or saliva of infected animals. Breathing in contaminated dust from rodent nests or droppings is the most common route of infection.
Hantavirus causes two main clinical syndromes. In the Americas, the primary concern is Hantavirus Pulmonary Syndrome (HPS), a severe respiratory disease. In Europe and Asia, the more common presentation is Hemorrhagic Fever with Renal Syndrome (HFRS), which affects the kidneys rather than the lungs. Dogs and cats cannot carry or transmit hantavirus to humans.
Hantavirus Symptoms: Early Warning Signs to Watch For
Recognising hantavirus early is critical — and notoriously difficult — because the initial symptoms are nearly identical to the flu.
Early-Stage Symptoms (Days 1–4):
- Fever and chills
- Severe headache
- Muscle aches, particularly in the thighs, hips, back, and shoulders
- Fatigue and general weakness
- Nausea, vomiting, and stomach discomfort
Late-Stage Symptoms (Days 4–10):
- Persistent coughing
- Shortness of breath
- Tightness in the chest
- Fluid accumulation in the lungs
- Rapid progression to respiratory failure in severe cases
If you have had any exposure to rodents or rodent-contaminated environments and begin experiencing these symptoms — particularly difficulty breathing — seek emergency medical care without delay.
How Dangerous Is Hantavirus?
Hantavirus is one of the more lethal infections a person can contract from an animal source. HPS carries a fatality rate of approximately 38%, meaning nearly four in ten people who develop the respiratory form of the disease die from it. Severe cases can deteriorate rapidly, with most deaths occurring within 24 to 48 hours of the onset of the cardiopulmonary phase. The severity depends on which strain of the virus is involved — some strains cause fatality rates between 5% and 15%, while others are considerably less aggressive.
Hantavirus Treatment: What Doctors Can Do
There is currently no specific antiviral treatment, cure, or approved vaccine for hantavirus infection. This makes early recognition and supportive medical care the only meaningful interventions available.
Supportive treatment typically includes:
- Rest and hydration in mild cases
- Hospitalisation as soon as HPS is suspected, ideally in an intensive care unit
- Intubation and mechanical ventilation to assist breathing and manage fluid in the lungs
- Extracorporeal membrane oxygenation (ECMO) in the most severe cases, where blood is circulated through a machine to add oxygen and remove carbon dioxide
- Broad-spectrum antibiotics may be administered to rule out or address co-infections while diagnosis is confirmed
- Fever reducers and pain relievers for symptom management
Time is the critical factor. Patients who receive intensive care early stand a meaningfully better chance of survival. Once a patient reaches full respiratory distress, treatment becomes significantly less effective.
How Hantavirus Is Diagnosed
Early diagnosis is challenging because the initial symptoms resemble so many other common illnesses including influenza and even COVID-19. A doctor will typically order an enzyme-linked immunosorbent assay (ELISA) blood test to detect antibodies to the virus. However, diagnosing hantavirus in a person infected for less than 72 hours is difficult. If an initial test comes back negative but symptoms persist and rodent exposure is suspected, repeat testing is recommended 72 hours after symptom onset.
When speaking to a doctor, always disclose any recent exposure to rodents, rodent droppings, or enclosed spaces that may have been infested — this information is essential for an accurate and timely diagnosis.
How to Prevent Hantavirus
Prevention centres almost entirely on avoiding contact with rodents and the environments they contaminate.
At home:
- Seal all holes and gaps in walls, floors, and foundations — even gaps as small as a pencil width
- Use snap traps to control rodent populations indoors and outdoors
- Store all food in sealed, rodent-proof containers
- Remove clutter and potential nesting sites from garages, sheds, and storage areas
When cleaning potentially contaminated spaces:
- Always wear rubber or plastic gloves
- Use a bleach-based disinfectant solution before sweeping or vacuuming — never dry sweep rodent droppings, as this aerosolises the virus
- When opening a cabin, shed, or enclosed space that has been unused, open all windows and doors and allow it to air out for at least 30 minutes before entering
When camping or travelling:
- Sleep on a ground cover and pad rather than directly on the ground
- Keep food stored securely and away from your sleeping area
- Avoid contact with wild rodents of any kind
Why This Outbreak Matters Globally
The MV Hondius outbreak is particularly alarming because it occurred in a closed international environment with passengers from multiple countries — exactly the scenario that makes containment and contact tracing most complex. Hantavirus had already re-entered public consciousness following the high-profile death of Betsy Arakawa, wife of the late actor Gene Hackman, who died from hantavirus infection in New Mexico.
With WHO now actively sequencing the virus and coordinating evacuations across multiple nations, this event is being treated with the full weight of an international public health response.
What Should You Do If You Suspect Hantavirus?
If you have recently been exposed to rodents or rodent-contaminated environments and are now experiencing fever, body aches, or any difficulty breathing:
- Go to an emergency room immediately
- Tell your doctor specifically about any rodent exposure — do not omit this detail
- Do not wait to see if symptoms improve on their own
- Early intensive care is your best and only meaningful treatment option
Conclusion
The WHO’s active investigation into the MV Hondius hantavirus outbreak is a stark reminder that rare diseases can emerge anywhere — even aboard a vessel in the middle of the Atlantic Ocean. While hantavirus remains uncommon, its high fatality rate and the absence of a specific cure mean that awareness, prevention, and early medical action are the only reliable tools available. Stay informed, keep your environment rodent-free, and act without delay if symptoms appear.