Hantavirus in South America: A Physician's Prevention Guide for Travelers (2026)
Physician-written guide to preventing hantavirus in South America. Patagonia, Andes hiking, refugios, symptoms, and what to do if exposed. Updated for 2026.
Hantavirus in South America: A Physician's Prevention Guide for Travelers
If you're heading to Patagonia, Torres del Paine, the Andes, or anywhere in southern South America in 2026, the recent MV Hondius outbreak has probably put hantavirus on your radar. Here is what an emergency medicine physician actually wants you to know — practical, prevention-focused, and built around what we are telling our own patients this week.
Andes hantavirus is endemic to wild rodent populations in Argentina, Chile, Bolivia, and parts of Peru. It is rare, with several hundred cases reported per year across all of South America, and the overwhelming majority of those cases occur in rural locals, not international travelers. According to the WHO and Pan American Health Organization, fewer than 5% of recorded hantavirus cases are travel-associated. The simple discipline of avoiding rodent droppings in rustic accommodation, plus knowing the early symptom pattern, removes nearly all of the practical risk. We'll walk through it step by step.
Where Hantavirus Lives in South America
The Andes virus and related New World hantaviruses circulate in wild rodent populations across a large geographic band of southern and western South America. The reservoir species is primarily the long-tailed pygmy rice rat (Oligoryzomys longicaudatus), with several other Oligoryzomys and Calomys species also carrying related strains.
Highest-risk regions for travelers:
- Argentine Patagonia — Bariloche, El Bolsón, the Lake District, and the broader Río Negro and Neuquén provinces. This region accounts for the largest share of Argentine hantavirus cases.
- Chilean Patagonia and Aysén Region — including Torres del Paine National Park, Chiloé Island, and the Carretera Austral corridor.
- Northwest Argentina — Salta and Jujuy provinces have a separate enzootic focus.
- Southern Bolivia and southern Peru — sporadic cases reported, generally lower incidence.
- Brazilian Atlantic Forest fringes — a different strain (Juquitiba virus), occasional cases.
Lower-risk South American destinations:
- Coastal Brazil cities and most beach destinations.
- Major urban areas across the continent.
- Galapagos Islands.
- Most Amazon basin lodge-based travel.
If your itinerary is mostly hotels in cities and well-maintained eco-lodges, your hantavirus risk is essentially zero. The risk concentrates in trekkers, campers, and travelers using rustic shelters, especially in Patagonia and the Andes during peak season (late spring to early autumn in the Southern Hemisphere — November through April).
How Travelers Actually Get Hantavirus
The transmission story matters because it tells you exactly what to avoid.
The dominant route is inhaling aerosolized particles from dried rodent excreta. Picture this scenario: you arrive at a refugio (mountain hut) at the end of a long trek day, drop your pack on a wooden bunk, sweep the floor of dust and what looks like crumbs, shake out a sleeping bag that's been folded in a closet for three months, and breathe in the resulting cloud. If a hantavirus-infected rodent has nested anywhere in that structure during the off-season, those "crumbs" can include dried droppings and the cloud can include viable virus particles.
Less common but documented routes:
- Direct contact with rodent urine, droppings, saliva, or a rodent bite, followed by touching your eyes, nose, or mouth.
- Contaminated food or water — opening a granola bar that mice have nibbled, drinking from an unattended water bottle.
- Person-to-person transmission of the Andes strain — rare (2–5% of cases), requires close prolonged contact.
Routes that do not transmit hantavirus:
- Mosquito or tick bites.
- Casual hiking past a rodent burrow on a trail (you cannot get hantavirus from being outside in endemic territory; you have to be in an enclosed space with disturbed droppings).
- Domestic dogs and cats; standard tourist food at restaurants and lodges.
The actionable insight: the hantavirus traveler-risk equation is mostly about how you handle enclosed, rustic spaces — huts, refugios, basement cabins, sheds, abandoned buildings — and not about being outdoors in endemic regions in general.
Booking a Patagonia trek? We can prescribe altitude sickness medication, traveler's diarrhea antibiotics, and motion sickness coverage before you leave. Start your Wandr visit →
The 8-Point Hantavirus Prevention Checklist for Travelers
This is the same checklist our clinical team gives Patagonia and Andes-bound patients. Print it, screenshot it, do whatever you need to do — these eight habits cover the practical risk.
1. Choose Accommodations With Active Rodent Control
Established refugios run by national parks (CONAF in Chile, APN in Argentina) and major guiding outfitters generally have rodent-control protocols and seasonal cleaning. Privately rented cabins, abandoned buildings, and informal shelters are a different category of risk. When in doubt, ask the booking host about rodent control before arrival. If you see droppings on arrival, request a different room or move on.
2. Never Sleep in a Space With Visible Rodent Droppings
This is the single highest-leverage rule. If you arrive at a hut or rented cabin and see what looks like rodent droppings — dark grain-of-rice-sized pellets, especially in corners, on shelves, or in cabinets — do not sleep there until the space has been wet-cleaned by someone with proper precautions. Politely decline and find alternative shelter.
3. Wet-Clean, Never Dry-Sweep
If you must clean a dusty rustic space yourself, this is the single most important technique: never dry-sweep or vacuum. Dry sweeping aerosolizes the very particles you're trying to remove. Instead:
- Spray surfaces thoroughly with a dilute bleach solution (one part bleach to nine parts water) or a disinfectant.
- Let it sit for at least 15 minutes.
- Wipe with paper towels or a damp cloth, then dispose of the cloth.
- Wash hands thoroughly with soap and water afterward.
- If you have an N95 or KN95 mask available, wear it during the cleaning.
4. Air Out Closed Spaces Before Spending Time in Them
If you arrive at a cabin or refugio that has been closed up, open all the windows and doors and let it air out for at least 30 minutes before settling in. UV light and fresh air both reduce viral viability. This step alone meaningfully reduces inhalation risk.
5. Store Food in Rodent-Proof Containers
Hantavirus transmission via contaminated food is rare but documented. Use sealed containers (hard plastic, metal tins) for any food stored at a hut, hostel, or campsite. Do not eat anything that shows signs of rodent disturbance — chew marks, droppings nearby, gnawed packaging. When in doubt, throw it out.
6. Camp Smart
If you're camping in the backcountry:
- Pitch tents on dry ground, not in rodent-burrow areas.
- Do not sleep directly on bare ground without a tent floor.
- Store food in animal-resistant bags or hangs, away from your sleep area.
- Keep your tent zipped fully, especially at night.
- Inspect any old shelter or windbreak structure for droppings before using it.
7. Skip the Abandoned Buildings
Trekkers love exploring old estancias, abandoned shepherd huts, and ruined structures. These are exactly the places where rodents have undisturbed long-term nesting. Photograph them from outside; do not enter, sleep in, or take shelter in them. If a sudden storm forces you inside, wait it out without disturbing dust, surfaces, or stored materials, and air the space out as much as possible while you're there.
8. Know What to Do if You're Exposed
If you think you've had a meaningful rodent-droppings exposure (slept in a hut with visible droppings, dry-swept a dusty cabin without precautions, handled a dead rodent without gloves), the right move is not to panic but to monitor. Note the date of exposure, watch for fever and severe muscle aches over the next 1–8 weeks, and seek prompt medical evaluation if symptoms develop. Tell the clinician about your South America trip and possible rodent exposure — that history is what triggers hantavirus testing.
Symptoms a Traveler Should Recognize
The same symptom pattern applies whether you've returned home or you're still on the trail. Hantavirus pulmonary syndrome has a two-phase course.
Phase 1 — Prodrome (first 1–5 days of illness):
- Fever, often above 101°F / 38.3°C
- Severe muscle aches, especially in the thighs, hips, lower back, and shoulders
- Headache
- Profound fatigue
- Gastrointestinal symptoms — nausea, vomiting, diarrhea, abdominal pain
- Chills and dizziness
Phase 2 — Cardiopulmonary phase (4–10 days from symptom onset):
- Sudden, rapidly worsening shortness of breath
- Cough
- Pulmonary edema (fluid in the lungs) on imaging
- Low blood pressure
- Rapid heart rate
The transition from phase 1 to phase 2 can happen in less than 24 hours. Once it begins, the patient needs ICU-level care. The single most important intervention is recognizing the syndrome before phase 2 starts — which is why disclosing your travel history at any clinical encounter matters so much.
If you have returned from Patagonia, the Andes, or any endemic region within the last 8 weeks and you develop fever plus severe muscle aches, do not wait. Get evaluated and tell the clinician where you traveled.
What to Pack: A Realistic Travel Health Kit for Patagonia and the Andes
Hantavirus is one risk. The much more common risks for South America trekkers are altitude sickness, traveler's diarrhea, motion sickness on long bus rides, and weather-related issues. Our standard recommendation for patients heading to this region:
Wandr can prescribe the portion of this kit — acetazolamide, azithromycin or ciprofloxacin, ondansetron, meclizine, and ibuprofen — without a clinic visit. Our clinical team reviews your itinerary, builds a plan that matches your altitude profile and trip length, and sends your prescriptions to your preferred pharmacy.
Build your Patagonia or Andes med kit in one visit. Start your Wandr consultation →
Special Situations
If You're Trekking Torres del Paine or El Chaltén
These are world-class circuits with established refugio networks. Stay in refugios run by Vértice, Fantástico Sur, or CONAF concessionaires; these operators run rodent-control programs. Avoid sleeping in non-managed shelters or abandoned structures along the way. The W Trek, the O Circuit, and the Fitz Roy / Cerro Torre routes all have managed accommodation options.
If You're Hiking Above 3,500 Meters in the Andes
Altitude sickness is statistically a much bigger risk for you than hantavirus. We strongly recommend acetazolamide prophylaxis, gradual ascent, and adequate hydration. The hantavirus rule still applies — no dry-sweeping, no sleeping in droppings — but altitude is the headline.
If You're Pregnant or Immunocompromised
Hantavirus pulmonary syndrome is more dangerous in patients with compromised immunity, and pregnancy adds complexity to managing severe respiratory illness. We do not categorically recommend against South America travel for these groups, but we do recommend a pre-trip visit to map a more conservative itinerary — managed accommodations only, lower-risk regions, and a clear medical evacuation plan.
If You Were a Passenger on the MV Hondius
Different scenario — see our companion piece on the MV Hondius cruise ship outbreak for cruise-specific guidance.
The Bottom Line
For the vast majority of travelers heading to Patagonia, Argentina, Chile, or the Andes, hantavirus is a low-probability, high-impact risk that is almost entirely manageable with simple discipline around enclosed rustic spaces. Avoid droppings, never dry-sweep, choose managed accommodations, and recognize the early symptom pattern. That is, in our clinical experience, the entire prevention story for travelers.
Combine that with a properly built travel health kit — altitude meds, GI antibiotics, motion sickness coverage — and you've handled the realistic spectrum of risks for this region.
If you want a physician to build that plan for you, prescribe what you need, and ship it before you leave: that is exactly what Wandr exists for.
Get your South America travel health plan from a Wandr physician. Same-day visits, prescriptions delivered before your trip. Start your visit →
Frequently Asked Questions
Is there a hantavirus vaccine for travelers to South America? No. There is no FDA-approved hantavirus vaccine in the United States, and no approved vaccine for the Andes strain anywhere. Prevention relies entirely on avoiding rodent-droppings exposure in enclosed rustic spaces. Hantavirus vaccines exist in South Korea and China but only target the Old World strains responsible for hemorrhagic fever with renal syndrome, not the New World strains found in the Americas.
What is the risk of hantavirus in Torres del Paine or Patagonia in 2026? Risk for the average trekker is very low. Patagonia is endemic for Andes virus, but managed refugios and CONAF/APN concessionaire-run shelters generally have active rodent control. The traveler risk concentrates in unmanaged shelters, abandoned buildings, and self-arranged rustic accommodation. Standard prevention measures plus managed-accommodation choice make this a low-probability concern.
How long does hantavirus survive on surfaces? Hantavirus is a relatively fragile enveloped virus and is inactivated by sunlight, drying, and standard household disinfectants. In ideal indoor conditions (cool, dark, dusty), the virus may remain viable for several days in dried rodent excreta. Bleach solutions (one part bleach to nine parts water) and most household disinfectants kill the virus on surfaces with a 15-minute contact time.
Can my dog get hantavirus and pass it to me? Domestic dogs and cats are not significant reservoirs for Andes virus or other major hantaviruses. There is no documented case of pet-to-human hantavirus transmission. Wild rodent species (especially the long-tailed pygmy rice rat in southern South America) are the reservoir.
What should I tell a doctor if I think I was exposed to hantavirus? Be specific. Tell them: the dates of your South America trip, the specific regions you visited (Patagonia, Andes, Argentina, Chile), the type of accommodation you used (managed refugios vs. cabins vs. abandoned shelters), whether you saw or disturbed any rodent droppings, and the exact date and nature of any potential exposure. That history is what tells the clinician to consider hantavirus testing instead of treating you for a generic viral illness.
How is hantavirus diagnosed? Diagnosis is made through a combination of clinical presentation (fever, muscle aches progressing to respiratory distress) and laboratory testing — typically serology (IgM and IgG antibodies) and PCR for viral RNA. Imaging usually shows pulmonary edema in the cardiopulmonary phase. Diagnosis is sometimes delayed because the prodrome looks like flu; that is why disclosing travel history matters so much.
Is the Amazon basin a hantavirus risk? Generally low risk for travelers. Hantavirus circulates at low levels in some Amazon rodent species (and the Juquitiba virus is found in the Brazilian Atlantic Forest), but Amazon lodge-based eco-tourism rarely exposes travelers to the kind of dusty, enclosed, rodent-nested spaces that drive transmission. Standard rodent precautions still apply, but altitude sickness and traveler's diarrhea are much higher-probability concerns for Amazon travel.
Should I cancel a South America trip because of the cruise ship outbreak? No. The MV Hondius cluster is a single-vessel event. Land-based travel in South America has no current advisory beyond standard rodent-exposure precautions. Continue planned trips, choose managed accommodations, follow the 8-point checklist, and travel with a complete medication kit.
Sources
- World Health Organization. "Hantavirus." Fact sheet. https://www.who.int/news-room/fact-sheets/detail/hantavirus
- Centers for Disease Control and Prevention. "Hantavirus." https://www.cdc.gov/hantavirus/index.html
- Centers for Disease Control and Prevention. "Cleaning Up After Rodents." https://www.cdc.gov/rodents/cleaning/index.html
- Pan American Health Organization. "Hantavirus." https://www.paho.org/en/topics/hantavirus
- Padula PJ, et al. "Hantavirus pulmonary syndrome outbreak in Argentina: molecular evidence for person-to-person transmission of Andes virus." Virology. 1998. https://pubmed.ncbi.nlm.nih.gov/9499050/
- Martínez VP, et al. "'Super-spreaders' and person-to-person transmission of Andes virus in Argentina." NEJM. 2020. https://www.nejm.org/doi/full/10.1056/NEJMoa2009040
- Riquelme R, et al. "Hantavirus pulmonary syndrome, southern Chile, 1995–2012." Emerging Infectious Diseases. 2015. https://wwwnc.cdc.gov/eid/article/21/4/14-1437_article
- NaTHNaC (UK National Travel Health Network and Centre). "Hantavirus — country information." https://travelhealthpro.org.uk/disease/76/hantavirus
- CDC Yellow Book. "Hantavirus Pulmonary Syndrome." https://www.cdc.gov/yellow-book/hcp/travel-associated-infections-diseases/hantavirus.html
- World Health Organization. "Hantavirus cluster linked to cruise ship travel — Multi-country." Disease Outbreak News, May 2026. https://www.who.int/emergencies/disease-outbreak-news/item/2026-DON599
Emergency medicine physician and founder of Wandr Health. Built from real clinical experience treating travelers who came back sick, and a belief that travel health shouldn't cost a fortune or require a clinic visit.