How Deadly Is Hantavirus? Symptoms, Outbreak, Symptoms, WHO Warning And What Nigerians Should Know
Fears of another global health scare have intensified after reports emerged of a deadly Hantavirus outbreak aboard a transatlantic cruise ship, triggering widespread concern online and comparisons to the early days of COVID-19.
However, health experts and global authorities insist the situation is very different from the coronavirus pandemic and say there is currently no evidence of a looming worldwide emergency.
The latest concerns followed infections linked to the Dutch expedition cruise vessel MV Hondius, where multiple passengers reportedly became ill after suspected exposure to the Andes strain of hantavirus during travel in South America.
What Is Hantavirus?
Hantavirus is not a newly discovered disease. Scientists have studied it for decades, and it is primarily spread through exposure to infected rodents, especially rats and mice.
People usually become infected after inhaling tiny airborne particles contaminated by rodent urine, saliva, or droppings. In some cases, touching contaminated surfaces and then touching the nose or mouth may also lead to infection.
There are different strains of hantavirus around the world. In parts of Europe and Asia, the virus mainly affects the kidneys, causing a condition known as haemorrhagic fever with renal syndrome. In the Americas, especially with the Andes strain, the disease can trigger severe lung complications known as Hantavirus Pulmonary Syndrome.
How The Cruise Ship Outbreak Started
According to the World Health Organization, the first confirmed patient linked to the outbreak was a 70-year-old Dutch passenger who had travelled through parts of Argentina and South America before boarding the cruise ship.
Health investigators suspect the couple may have been exposed to infected rodents during a bird-watching excursion near a landfill area in Ushuaia, Argentina.
The man reportedly developed fever, headache, diarrhoea and respiratory complications days after boarding the ship before later dying onboard on April 11.
The WHO said the incubation period for hantavirus ranges from one to six weeks, making it clear the infection likely occurred before the passengers boarded the vessel.
Additional passengers later fell ill, including a British passenger evacuated to South Africa and another passenger hospitalised in Switzerland.
As of May 2026, health authorities confirmed multiple cases and at least three deaths connected to the outbreak.
Is Hantavirus Spreading Between Humans?
One of the biggest fears online has been whether the virus could spread rapidly from person to person like COVID-19.
Experts say this is highly unlikely.
Unlike COVID-19, which spreads efficiently through respiratory droplets, most hantavirus strains do not spread easily between humans.
The Andes strain remains the only known variant with limited human-to-human transmission, usually involving very close and prolonged contact.
Medical experts stress that hantavirus is primarily an environmental disease linked to rodents, not widespread community transmission.
A physician, Dr. Godwin Ekweke, explained that the current outbreak should not be interpreted as the beginning of another pandemic.
According to him, hantavirus infections are generally associated with environmental exposure rather than rapid person-to-person spread.
Symptoms Of Hantavirus
Early symptoms of hantavirus can resemble several common viral illnesses, making diagnosis difficult in the early stages.
Common symptoms include:
Fever
Severe headache
Muscle aches
Fatigue
Nausea and vomiting
Abdominal pain
Diarrhoea
In severe cases, patients may develop serious breathing difficulties as fluid builds up in the lungs.
Health experts warn that symptoms can worsen rapidly once respiratory complications begin.
Why Experts Are Not Comparing It To COVID-19
Despite social media panic, infectious disease specialists insist the virus behaves very differently from COVID-19.
Key differences include:
Hantavirus is mainly spread by rodents
Human transmission is extremely rare
There is no evidence of pre-symptomatic spread
Outbreaks are usually localised rather than global
The WHO has not declared any international public health emergency related to hantavirus and currently describes the global risk as low.
Can Hantavirus Reach Nigeria?
At the moment, there are no confirmed cases of Hantavirus in Nigeria.
However, experts say rodent-borne illnesses remain a concern because of sanitation challenges, overcrowding, flooding and poor waste disposal systems in some communities.
Nigeria already manages outbreaks of Lassa fever, another rodent-borne disease common in parts of the country.
Public health specialists say Nigeria’s existing surveillance systems developed during outbreaks of Ebola, COVID-19, cholera and Lassa fever could help authorities respond quickly if imported cases ever appear.
How To Protect Yourself From Hantavirus
Health experts recommend several preventive measures to reduce risk:
1. Control Rodents Around Homes
Seal cracks and holes that allow rats and mice into buildings.
2. Store Food Properly
Keep food in sealed containers and dispose of waste quickly.
3. Avoid Dust In Rodent-Infested Areas
Do not sweep dry rodent droppings directly because particles can become airborne.
4. Use Protective Gear
Wear gloves and masks when cleaning abandoned buildings or storage areas.
5. Seek Medical Attention Early
Anyone with persistent fever, weakness or breathing difficulty after possible rodent exposure should see a doctor immediately.
WHO And Global Response
The World Health Organization and several international health agencies are currently monitoring the outbreak closely.
Authorities have launched contact tracing efforts involving passengers from multiple countries, while laboratories continue testing suspected cases.
The United States Centers for Disease Control and Prevention has also activated monitoring protocols, although officials maintain that public risk remains low.
Final Thoughts
Although the Hantavirus outbreak aboard the MV Hondius has attracted global attention, experts say there is no evidence that the virus poses the same threat level as COVID-19.
For now, health specialists advise calm vigilance rather than panic.
Improved sanitation, rodent control, stronger disease surveillance and public awareness remain the most important tools for preventing future outbreaks.
