Hantavirus is a rare viral infection mainly transmitted by wild rodents. Although cases are uncommon, understanding how transmission occurs and recognising its symptoms can help detect the disease early and act promptly to avoid possible complications.
The virus is present in different regions of the world and may manifest differently depending on the variant and each person’s overall health condition. In most cases, the infection is associated with exposure to spaces where rodents have been present.
Hantavirus: what it is and how it spreads
Hantavirus belongs to a family of viruses found in certain rodents, especially field mice. Carrier animals do not usually become ill, but they can spread the virus through urine, droppings and saliva.
People may become infected by inhaling contaminated particles present in the dust of enclosed or poorly ventilated spaces.
Different types of hantavirus exist depending on the region of the world. Some variants mainly affect the kidneys, while others may cause more severe lung involvement.
The most common form of transmission is breathing in contaminated particles when cleaning or entering places where rodents have been present, for example:
- garages
- storage rooms
- warehouses
- barns
- cabins closed for long periods of time
The risk increases especially in poorly ventilated spaces where traces of rodent urine or droppings may accumulate.
Transmission may also occur:
- by touching contaminated surfaces and then touching the face
- through rodent bites
- through contaminated food or water
Unlike other respiratory infections, hantavirus is not usually transmitted easily between people.
Andes strain: the main exception
The Andes strain is a variant of hantavirus found mainly in Argentina and Chile.
What makes the Andes virus particularly relevant is that, unlike most known hantaviruses, cases of person-to-person transmission have been documented.
Although this type of transmission remains uncommon, cases have been described among household members and prolonged close contacts.
Studies suggest that transmission could occur through respiratory secretions during the early stages of the disease.
Even so, it is important to put this information into context:
- person-to-person transmission of the Andes virus is exceptional
- it does not have the same transmission capacity as other respiratory viruses
- the main route of transmission continues to be contact with infected rodents
Hantavirus symptoms
Symptoms usually appear between one and five weeks after exposure and, at first, may be confused with flu or other viral infections.
The most common symptoms are:
- fever
- muscle pain
- headache
- extreme fatigue
- nausea or vomiting
In some cases, warning signs may appear such as:
- difficulty breathing
- shortness of breath
- decreased urine output
In the most severe forms, especially in some American variants, significant lung involvement may occur and require urgent hospital care.
When should you see a doctor?
It is important to consult a healthcare professional if fever and breathing difficulties appear after being in contact with places where rodents or their traces may have been present.
It is also advisable to inform your doctor if you have recently been in rural areas, warehouses or enclosed spaces with accumulated dust.
Early detection and prompt medical attention are essential to improve clinical outcomes.
How to prevent hantavirus
To reduce the risk of exposure:
- ventilate enclosed spaces before cleaning them
- wear a mask and gloves if there are traces of rodents
- avoid dry sweeping contaminated areas
- clean beforehand using disinfectant or diluted bleach
- store food in sealed containers
- seal cracks or holes through which rodents may enter
Although hantavirus is a rare disease, understanding how it spreads and recognising its symptoms can help people act promptly in the event of a possible infection.