How bad is hantavirus?
It can be very serious.
There are two major forms of disease:
- Hantavirus Pulmonary Syndrome (HPS / HCPS)
- Mainly found in the Americas.
- Attacks the lungs and heart.
- Can cause fluid buildup in the lungs and respiratory failure.
- Fatality rates can reach 30–50% in severe cases.
- Hemorrhagic Fever with Renal Syndrome (HFRS)
- More common in Europe and Asia.
- Primarily damages the kidneys and blood vessels.
- Fatality rates vary from under 1% to about 15% depending on the strain.
Early symptoms
At first it may look like ordinary flu:
- Fever
- Muscle pain
- Fatigue
- Headache
- Nausea
- Vomiting
- Chills
Then suddenly it can worsen:
- Severe breathing problems
- Low blood pressure
- Kidney failure
- Shock
- Organ failure
That rapid worsening is what makes it dangerous.
Is it contagious between humans?
Usually no.
Most hantaviruses spread only from rodents to humans. However, one strain called the Andes virus in South America has shown limited human-to-human transmission among close contacts.
This is why recent news reports about an Andes hantavirus outbreak on a cruise ship attracted global attention. WHO still says the overall pandemic risk is low because hantavirus does not spread nearly as easily as viruses like COVID-19 or influenza.
History of hantavirus
Ancient origins
Hantaviruses are believed to be ancient viruses that evolved alongside rodents for thousands or even millions of years.
Korean War (1950s)
The disease first became widely recognized during the Korean War when thousands of UN soldiers developed a mysterious hemorrhagic fever causing kidney failure and bleeding.
Scientists later identified the virus near the Hantan River in Korea — giving rise to the name “Hantavirus.”
1993 Four Corners outbreak (USA)
A major modern outbreak happened in 1993 in the “Four Corners” region of the United States (Arizona, New Mexico, Colorado, Utah). Healthy young adults suddenly developed severe lung failure and many died.
Researchers traced it to deer mice carrying a new strain called Sin Nombre virus. That outbreak led to the discovery of Hantavirus Pulmonary Syndrome.
Worldwide presence
Today hantaviruses are found across:
- Asia
- Europe
- North and South America
- Parts of Africa
China reports many cases yearly, while the Americas see fewer cases but often more severe disease.
Is ivermectin proven to treat hantavirus?
No. There is currently no proven scientific evidence that Ivermectin cures or effectively treats hantavirus in humans.
Some people online have promoted ivermectin during the recent outbreak, claiming it has antiviral effects, but infectious disease experts and health authorities say:
- It is mainly an antiparasitic drug.
- It has not been proven in clinical trials against hantavirus.
- Using unproven treatments may delay lifesaving hospital care.
What treatment actually works?
There is no specific cure yet. Treatment is mainly supportive:
- Oxygen therapy
- ICU care
- Mechanical ventilation
- Blood pressure support
- Dialysis if kidneys fail
- ECMO in severe lung failure cases
Early hospitalization greatly improves survival.
How to reduce risk
The main prevention is avoiding rodent exposure:
- Seal holes in homes
- Avoid sweeping dry rodent droppings
- Use gloves and disinfectant when cleaning
- Improve ventilation before entering dusty spaces
- Store food properly
- Control rats and mice populations
hantavirus has not caused a major known outbreak in Nigeria or West Africa the way diseases like Lassa Fever, Ebola Virus Disease, or Mpox have.
However, scientists are concerned because West Africa — including Nigeria — has:
- very large rodent populations,
- tropical environments,
- urban overcrowding,
- and limited wildlife-virus surveillance in some areas.
These conditions could allow rodent-borne viruses to emerge.
Has hantavirus been found in Nigeria?
There is very little confirmed evidence of major human hantavirus disease outbreaks in Nigeria.
But researchers have found:
- rodent-borne viruses,
- hantavirus-like viruses,
- and other dangerous zoonotic viruses in West African rodents.
Nigeria has much more experience with rodent-borne diseases like:
- Lassa Fever
- leptospirosis
- monkeypox/mpox reservoirs
- arenaviruses
rather than classic hantavirus epidemics seen in the Americas or East Asia.
Why experts are still worried
Hantaviruses spread mainly through:
- rat urine,
- droppings,
- saliva,
- contaminated dust.
West African cities often have:
- poor waste disposal,
- flooding,
- crowded housing,
- food storage problems,
- heavy rodent infestations.
That creates conditions where a rodent virus could spread more easily if introduced.
Studies in Nigeria have repeatedly shown large populations of virus-carrying rodents in homes and markets.
For example, research in Edo and Ondo States found widespread rodent infection with zoonotic viruses linked to human disease risk.
Why Lassa Fever matters in this discussion
In West Africa, Lassa Fever is often considered the “West African cousin” in terms of public-health concern because:
- it also comes from rodents,
- spreads in poor sanitation conditions,
- and can cause deadly hemorrhagic disease.
Unlike hantavirus, Lassa fever is already endemic in:
- Nigeria,
- Sierra Leone,
- Liberia,
- Guinea,
- and neighboring countries.
Nigeria records thousands of suspected Lassa fever cases yearly.
So West African health agencies tend to focus far more on Lassa fever than hantavirus.
Has there been a hantavirus outbreak in West Africa?
No major confirmed endemic hantavirus outbreak has been documented across West Africa comparable to:
- the U.S. Four Corners outbreak,
- South American Andes virus outbreaks,
- or Korean hemorrhagic fever epidemics.
The recent 2026 cruise-ship outbreak involved suspected Andes hantavirus linked to South America — not West Africa itself. Cape Verde and South Africa became involved only because the ship passed through Atlantic waters near Africa.
Could hantavirus become a future issue in Nigeria?
Possibly.
Scientists worry that:
- climate change,
- urban expansion,
- deforestation,
- wildlife trade,
- and human encroachment into forests
increase the risk of new zoonotic diseases emerging in Africa.
The experience with:
- COVID-19,
- Mpox,
- Ebola Virus Disease,
- and Lassa Fever
has made African disease surveillance much more alert to rodent and animal viruses.
Bottom line
- Hantavirus is not currently a major public-health crisis in Nigeria or West Africa.
- There are few confirmed human cases in the region.
- But West Africa has many environmental conditions that could support rodent-borne viruses.
- Nigeria’s bigger rodent-virus threat today remains Lassa Fever rather than hantavirus.