Andes virus is a rare but potentially serious infection that belongs to a group of viruses known as Hantaviruses. Like other Hantaviruses found in the Americas, it is primarily carried by rodents and can infect people through contact with contaminated environments. Understanding how Andes virus affects the body can help people recognize symptoms, reduce exposure risks, and seek timely medical care when needed.
Although infections are uncommon, Andes virus has received special attention because it is one of the few Hantaviruses known to have rare person-to-person transmission. Most infections, however, still occur after exposure to infected rodents or their droppings, urine, saliva, or contaminated dust.
What is Andes virus?
Andes virus is a rodent-borne virus found mainly in parts of South America, particularly Argentina and Chile. It is a cause of Hantavirus pulmonary syndrome (HPS), a severe disease that primarily affects the lungs and can lead to life-threatening complications.
People usually become infected when they breathe in tiny virus-containing particles that become airborne from contaminated rodent waste. Infection can also occur through direct contact with contaminated materials or, less commonly, through rodent bites.
Unlike most other Hantaviruses, Andes virus has been associated with rare person-to-person transmission, typically involving close contact with an infected individual.
What happens after the virus enters the body?
After exposure, the virus does not usually cause immediate symptoms. The incubation period can vary, and a person may feel healthy for days or even weeks before signs of illness appear.
Once inside the body, Andes virus enters cells and begins to multiply. The immune system responds by attempting to eliminate the infection. While this response is important, some of the illness results from the body’s reaction to the virus rather than direct damage caused by the virus itself.
The virus particularly affects the lining of small blood vessels. As inflammation develops, blood vessels can become more permeable, allowing fluid to leak into surrounding tissues. This process plays a major role in the development of Hantavirus pulmonary syndrome.
How Andes virus affects different body systems
The immune system
The immune system is activated soon after infection begins. White blood cells and other immune defenses attempt to control the virus.
This immune response can cause many of the early symptoms that people experience, including:
- Fever
- Chills
- Fatigue
- Headache
- Muscle aches
- General feelings of illness
These symptoms are common in many viral infections, which can make early diagnosis difficult.
The lungs
The lungs are the most important organs affected during severe Andes virus infection.
As blood vessels in the lungs become leaky, fluid can accumulate inside lung tissues and air spaces. This makes it increasingly difficult for oxygen to move into the bloodstream.
As the illness progresses, symptoms may include:
- Shortness of breath
- Rapid breathing
- Persistent cough
- Chest tightness
- Difficulty performing normal activities
This stage is known as Hantavirus pulmonary syndrome and requires urgent medical attention.
The cardiovascular system
The heart and circulatory system may also be affected.
When fluid shifts out of blood vessels and into tissues, blood pressure can drop. The heart must work harder to maintain circulation throughout the body.
In severe cases, people may experience:
- Low blood pressure
- Dizziness
- Weakness
- Rapid heart rate
- Shock
These complications are medical emergencies and require hospital care.
Other organs and tissues
Although lung involvement is often the most serious concern, Andes virus can affect the body more broadly.
Some people may experience:
- Nausea
- Vomiting
- Abdominal pain
- Diarrhea
- Back pain
- Joint discomfort
These symptoms can appear before respiratory problems develop, sometimes causing the illness to resemble influenza or other viral infections.
Early and later Hantavirus symptoms
Recognizing the progression of Hantavirus symptoms is important.
Early symptoms
Common early symptoms include:
- Fever
- Fatigue
- Headache
- Muscle pain, especially in the legs and back
- Chills
- Nausea
- Stomach discomfort
Later symptoms
As the disease progresses, symptoms may include:
- Shortness of breath
- Persistent cough
- Chest pain or pressure
- Difficulty breathing
- Severe weakness
Not every person experiences symptoms in the same way, and severity can vary considerably.
Common exposure situations
Most infections occur after contact with environments contaminated by infected rodents.
Examples include:
- Cleaning cabins, sheds, or garages with rodent activity
- Entering unused buildings after long periods of closure
- Handling nesting materials
- Working in barns or storage facilities
- Camping in areas with rodent infestations
- Disturbing dust contaminated with rodent waste
People often become exposed without realizing rodents were present.
Hantavirus prevention and reducing risk
Preventing exposure remains the most effective protection against Andes virus and other Hantavirus infections.
Safe cleaning practices
When cleaning areas that may contain rodent droppings:
- Open doors and windows and ventilate the area before cleaning
- Leave the space ventilated for at least 30 minutes when possible
- Wear disposable or washable gloves
- Spray droppings and contaminated surfaces with disinfectant
- Allow the disinfectant to soak before removal
- Use paper towels or disposable materials for cleanup
- Wash hands thoroughly afterward
What to avoid
Avoid practices that can spread contaminated particles into the air:
- Do not sweep dry droppings
- Do not vacuum dry droppings
- Do not shake contaminated materials indoors
- Do not handle rodent nests without protection
Rodent-proofing measures
Helpful prevention steps include:
- Seal holes and gaps around buildings
- Store food in sealed containers
- Remove rodent nesting materials
- Keep indoor and outdoor areas clean
- Manage clutter that provides rodent shelter
- Dispose of garbage properly
These measures can significantly reduce the risk of contact with a rodent-borne virus.
When to seek medical care
Anyone who develops symptoms after possible rodent exposure should contact a healthcare professional, especially if fever and respiratory symptoms occur together.
Urgent medical care is needed for:
- Severe breathing problems
- Chest pain
- Confusion
- Blue lips or fingertips
- Fainting
- Rapidly worsening illness
There is currently no specific cure that eliminates Andes virus infection. Treatment focuses on supportive medical care, monitoring, oxygen support when needed, and management of complications. Early medical evaluation can improve the chances of receiving appropriate care before severe illness develops.
Why awareness matters
Andes virus is uncommon, but understanding how it affects the body helps people make informed decisions about prevention and health. The infection often begins with symptoms that resemble many common illnesses, yet it can progress rapidly in some individuals.
Awareness of rodent exposure risks, safe cleaning practices, and the warning signs of Hantavirus pulmonary syndrome can help individuals, families, travelers, and property owners reduce risk and seek medical attention promptly when necessary. Practical prevention measures remain the most effective defense against this rare but important infectious disease.
