It starts like the flu — fever, headache, muscle aches. But within days, it can become a life-threatening emergency. Hantavirus is back in the spotlight, and here's what you should know.
Key facts
- Hantaviruses are a group of viruses carried by rodents that can cause severe disease in humans.
- People usually get infected through contact with infected rodents or their urine, droppings or saliva.
- Infection with hantaviruses can cause a range of illnesses, including severe disease and death.
- In the Americas, hantaviruses can cause hantavirus cardiopulmonary syndrome (HCPS), a severe respiratory illness, with a case fatality rate up to 50%.
- Andes virus, found in South America, is a currently known hantavirus for which limited human‑to‑human transmission among contacts has been documented.
- In Europe and Asia, hantaviruses cause haemorrhagic fever with renal syndrome (HFRS).
What exactly is hantavirus?
Hantavirus isn't new — it's a family of viruses carried by rodents worldwide. The tricky part? The animals themselves don't get sick. They just carry the virus silently in their urine, droppings, and saliva, waiting to be disturbed by an unsuspecting human.
Two diseases, two continents
🌎 Americas
HCPS
Attacks the lungs and heart. Up to 50% fatality rate — one of the deadliest respiratory illnesses known.
🌍 Europe & Asia
HFRS
Targets the kidneys and blood vessels. Tens of thousands of cases reported each year, mainly in East Asia and northern Europe.
How do you catch it?
You don't need to be bitten. Simply breathing in dust from rodent droppings — say, while cleaning a dusty shed, barn, or cabin — is enough. Farming, forestry work, or even sleeping in a rodent-infested space puts you at risk.
Important: One strain — Andes virus in South America — is the only hantavirus known to spread person-to-person, though still rarely, through very close contact.
Symptoms and clinical presentation
Symptoms appear 1–8 weeks after exposure and often mimic flu:
depending on the type of virus, and typically include fever, headache, muscle aches and gastrointestinal symptoms such as abdominal pain, nausea or vomiting.
- In HCPS, the disease may progress rapidly to cough, shortness of breath, accumulation of fluid in the lungs and shock.
- In HFRS, later stages may include low blood pressure, bleeding disorders and kidney failure.
Diagnosis
Early diagnosis of hantavirus infection can be challenging because early symptoms are common with other febrile or respiratory illnesses, such as influenza, COVID-19, viral pneumonia, leptospirosis, dengue or sepsis. A careful patient history is therefore essential, with particular attention to possible rodent exposure, occupational and environmental risks, travel history, and contact with known cases in areas where hantaviruses are present.
Laboratory confirmation relies on serological testing to detect hantavirus-specific IgM antibodies or rising IgG titres, as well as molecular methods such as reverse transcription polymerase chain reaction (RT-PCR) during the acute phase of illness, when viral RNA may be detectable in blood.
Can it be treated?
Here's the sobering reality: there is no approved vaccine or specific antiviral cure. Treatment is supportive — intensive monitoring of heart, lung, and kidney function. The earlier you get to a hospital, the better your chances.
How to protect yourself
Seal gaps and holes where rodents could enter your home
Never dry-sweep droppings — dampen the area first
Store food in rodent-proof containers
Wash hands thoroughly after any outdoor or farm work
Bottom line: Hantavirus is rare, but deadly when it strikes. The best protection is knowing where it hides and keeping rodents out of your life. Stay clean, stay alert, and if something feels off after rodent exposure — get to a doctor fast.
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