A recent outbreak of Hantavirus has sparked global attention in 2026, raising concerns among health authorities worldwide. While experts say the overall risk remains low, the unusual circumstances of this outbreak have made it a topic of international concern.
Here’s a clear breakdown of what’s happening:
What is hantavirus?
Hantavirus belongs to the Hantaviridae family of viruses carried by rodents. It is a rare but potentially deadly virus typically spread to humans through contact with infected rodents (rats, mice) through their urine, faeces, or saliva. There are over 40 known types and species of hantavirus identified worldwide, which are broadly categorized into “Old World” (Europe/Asia) and “New World” (Americas) groups.
What is the origin of the 2026 outbreak?
The current hantavirus outbreak began in April 2026, when a cluster of infections was identified aboard a cruise ship traveling from Ushuaia, South America, named M.V. Hondius.
The index case, a Dutch man who had travelled through Chile, Uruguay, and Argentina between November 27, 2025, and April 1, 2026, is believed to have presented the first symptoms of the virus. He died on April 11, 2026, while on board the MV Hondius, and his body was removed from the vessel thirteen days later. Two days later, she also died in a hospital in Johannesburg.
On May 6, the World Health Organization announced that the virus involved in the cluster was an Andes virus. The Andes virus (ANDV) is a specific strain endemic to South America, particularly Argentina and Chile.
As of May 7, 2026, the WHO has confirmed eight cases, including three deaths.
Key facts to know about Hantavirus
1. Its main source of transmission is through rodents
Hantavirus is primarily carried by rodents such as rats and mice. Humans can become infected through contact with rodent urine, feces, or saliva, especially when these particles become airborne, or by touching contaminated surfaces.
2. Andes virus is the only type of hantavirus that is known to spread person-to-person
Unlike many viral infections, hantavirus typically does not spread between humans, but the Andes virus strain possesses a unique capability for human-to-human transmission, especially for people who have close physical contact with the infected person.
3. It can cause severe respiratory conditions
One of the most serious conditions caused by hantavirus is Hantavirus Pulmonary Syndrome (HPS), which affects the lungs and can become life-threatening if not treated early. Another one is hemorrhagic fever with renal syndrome (HFRS), a severe and deadly disease that affects the kidneys.
4. Its early symptoms often mimic common illnesses
Symptoms of HPS usually start to show one to eight weeks after contact with an infected rodent, while symptoms of HFRS usually develop within one to two weeks after exposure.
Initial symptoms often mimic common illnesses like the flu. These may include fever, fatigue, muscle aches, and headaches. Within days, symptoms may escalate to the following: shortness of breath, coughing, and difficulty breathing. At this stage, urgent medical attention is critical.
5. It has a high fatality rate
Hantavirus infections, especially HPS, can be deadly. 35-40% of people who develop respiratory symptoms may die from the disease. Severe cases result in acute respiratory distress and heart failure. According to health authorities like the Centers for Disease Control and Prevention, the fatality rate for severe cases can be significant if not treated promptly.
6. There is no approved cure or vaccine yet
Currently, there is no approved vaccine or specific antiviral treatment for hantavirus. Medical care focuses on supportive treatment, especially in intensive care units.
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7. Cleaning rodent-infested areas requires caution
Never sweep or vacuum rodent droppings, as this can release the virus into the air. Instead:
- Use disinfectant sprays
- Wear gloves and masks
- Properly ventilate the area
8. Prevention is the best protection
The best way to avoid hantavirus is to limit exposure to rodents. This includes:
- Keeping homes clean
- Sealing holes and entry points
- Properly storing food
- Avoiding contact with rodent droppings