Travel Health Guide: Argentina — Yellow Fever, Altitude, Hantavirus, and What Most Travelers Miss
Physician-written travel health guide for Argentina. Yellow fever for Iguazu, altitude in the Northwest, hantavirus in Patagonia, dengue, and what to pack.
Travel Health Guide: Argentina — Yellow Fever, Altitude, Hantavirus, and What Most Travelers Miss
Argentina is one of the most geographically extreme destinations a US traveler can pick, which means the health prep is region-specific rather than country-wide. Buenos Aires is a low-risk, modern capital where the main concerns are routine vaccines, water in summer, and pickpockets. Iguazu Falls and the northeast jungle sit inside a yellow-fever transmission zone, and the CDC recommends the vaccine for travelers visiting Misiones, Corrientes, Chaco, Formosa, and northern Salta or Jujuy. The northwest highlands (Salta, Jujuy, the Salinas Grandes, Quebrada de Humahuaca, and Purmamarca) routinely climb above 11,000 feet, where altitude sickness affects roughly 25 percent of unprepared travelers. Patagonia carries a small but serious risk of Andes hantavirus, transmitted by rodents, particularly in rustic cabins and rural areas. Dengue cases surged across Argentina in 2024 and remain elevated through 2025 to 2026, peaking December through May. As a clinician, I tell every Argentina-bound traveler the same thing: prep four to six weeks out, match your vaccines and medications to the regions on your itinerary, and do not assume Buenos Aires-only risks apply to your whole trip. This guide walks through what you actually need, region by region.
Quick Facts: Argentina Health Snapshot
Overview: A Country Where Geography Drives Health Risk
Argentina stretches more than 2,300 miles north to south, from subtropical jungle bordering Brazil to subantarctic glaciers in Tierra del Fuego. That range means the health profile of a Buenos Aires-only city break has almost nothing in common with a Salta-and-Jujuy road trip, and neither overlaps much with a Patagonia trekking itinerary or a wine-and-altitude trip through Mendoza. Most travelers visiting Argentina hit at least two of these regions, which is why region-by-region planning matters more here than for many other South American destinations.
The other reason geography matters: Argentina has had genuine, documented surges in mosquito-borne illness over the last two years. The Pan American Health Organization (PAHO) reported more than 521,000 dengue cases in Argentina during the 2023 to 2024 season, the largest outbreak on record, with transmission extending farther south than ever before, including the Buenos Aires metropolitan area. Cases stayed elevated through 2025 and into the 2025 to 2026 summer. Travelers visiting between November and May should plan for active mosquito protection, not just casual repellent.
Across our team's experience treating returning travelers, the Argentina-related complaints we see most often are altitude sickness from rapid ascents to Salta or Jujuy, sunburn and dehydration from underestimating Patagonia's UV index, and traveler's diarrhea from rural empanada and asado stops outside Buenos Aires. None of these is medically dramatic. All of them are entirely preventable with a few weeks of prep.
Yellow Fever: When It Is Recommended, When It Is Required, and Iguazu Specifically
Yellow fever is the single most asked-about vaccine for Argentina, and the answer depends on which provinces your itinerary includes. The CDC recommends yellow fever vaccination for travelers visiting the provinces of Corrientes and Misiones (which includes Iguazu Falls on the Argentine side), and considers vaccination for travelers visiting designated areas in Chaco, Formosa, Jujuy, and Salta, particularly forested or jungle areas below 2,300 meters elevation.
Argentina does not require yellow fever vaccination for entry from the United States. However, several neighboring countries do require it for travelers arriving from yellow-fever-endemic areas. If your itinerary includes Argentina plus Brazil, Bolivia, Paraguay, or transits to Africa, check the destination country's entry requirements. The yellow fever vaccine certificate is valid for life under current World Health Organization (WHO) guidance, replacing the prior 10-year renewal rule.
Practical points:
- The vaccine takes at least 10 days to confer immunity. Do not get it the week before departure.
- Yellow fever vaccine is a live-attenuated vaccine. It is not given in pregnancy except in unavoidable high-risk circumstances, and it is contraindicated in significant immunosuppression and in infants under 9 months.
- Adults 60 and older have a slightly elevated risk of rare serious adverse events from a first-time yellow fever dose. The CDC recommends a careful risk-benefit conversation in this group, particularly for travelers who can adjust their itinerary to avoid the transmission zone.
- Iguazu Falls itself is a recommended-vaccination zone. The risk on the Argentine side is similar to the Brazilian side. Most travel medicine clinicians recommend the vaccine for any traveler heading to Iguazu unless contraindicated.
For a deeper dive on yellow fever side effects, schedule, who should and should not get it, and Wandr's booking flow, see our Yellow Fever Vaccine for Travelers guide.
Book your yellow fever vaccine appointment online.
Altitude Sickness in the Northwest and Mendoza
The Argentine Northwest, including Salta, Jujuy, the Salinas Grandes salt flats, the Quebrada de Humahuaca, Purmamarca, and Tilcara, sits at elevations that routinely cause altitude illness in travelers arriving from sea level. The Salinas Grandes sit at roughly 11,300 feet (3,450 meters), the Cuesta de Lipan pass climbs above 13,800 feet (4,200 meters), and many traveler-favorite stops sit between 8,000 and 11,500 feet.
Altitude sickness, also called acute mountain sickness (AMS), affects roughly 25 percent of unacclimatized travelers above 8,000 feet and more than 50 percent above 12,000 feet, according to CDC and Wilderness Medical Society guidance. Symptoms appear 6 to 12 hours after arrival and include headache, nausea, fatigue, poor sleep, and loss of appetite. Most cases are mild and self-resolve in 24 to 72 hours. A small percentage progress to severe forms (high-altitude pulmonary edema or cerebral edema), which are medical emergencies.
Mendoza, despite its reputation as a wine destination at moderate elevation (Mendoza city sits around 2,500 feet), includes high-altitude vineyards in the Uco Valley (3,300 to 5,500 feet) and adventure trips up Aconcagua approach valleys (above 9,000 feet). Travelers planning Aconcagua treks or high-altitude winery tours should plan for altitude prep.
Practical altitude prevention:
- Acetazolamide (Diamox) is the first-line preventive medication. Standard dosing is 125 mg twice daily, started one to two days before ascent and continued for two to three days at altitude. It works by mildly acidifying the blood, which speeds up the body's natural acclimatization. Side effects include tingling in the fingers and around the mouth, and a strange taste from carbonated drinks. Both are harmless.
- Ibuprofen has shown benefit for altitude headache prevention in clinical trials and is a reasonable add-on.
- Sleep low when possible. If your itinerary climbs the Cuesta de Lipan during the day, sleep back down in Purmamarca or Tilcara that night.
- Hydrate aggressively, skip alcohol the first 24 to 48 hours, and avoid sleeping pills until acclimatized.
- Watch for red flags. A traveler who develops shortness of breath at rest, confusion, ataxia (stumbling, unable to walk a straight line), or persistent vomiting needs descent and medical care.
Altitude sickness medication is prescription-only in the United States. Wandr's clinicians can review your itinerary, confirm acetazolamide is appropriate for your medical history, and call the prescription in to your local pharmacy for pickup before departure.
Get altitude sickness medication before your Argentina trip.
For more on altitude prevention and recognition, see our Altitude Sickness: Symptoms, Prevention & Treatment for Travelers guide.
Dengue Fever: Argentina's 2024 Surge and What It Means for 2026 Travelers
Dengue is now the most relevant mosquito-borne illness for travelers heading to Argentina between November and May. Historically considered a low-burden country for dengue, Argentina recorded more than 521,000 cases during the 2023 to 2024 transmission season per PAHO data, including local transmission in the Buenos Aires metropolitan area for the first time at scale. The 2024 to 2025 season was lower in absolute numbers but still well above the pre-pandemic baseline. As of early 2026, dengue continues to circulate.
Dengue is transmitted by Aedes aegypti, a daytime-biting mosquito that thrives in urban environments with standing water. Travelers visiting Argentina between November and May, particularly those in the north (Misiones, Corrientes, Chaco, Formosa, Salta, Jujuy), the central provinces (Cordoba, Santa Fe, Entre Rios), and the Buenos Aires metropolitan area should plan for active mosquito protection.
Practical dengue prevention:
- Use a repellent containing 20 to 30 percent DEET, picaridin, or oil of lemon eucalyptus. Apply before going outside and reapply per label.
- Aedes aegypti bites during the day, especially early morning and late afternoon. Repellent is not just an evening tool in Argentina.
- Wear long sleeves and pants in the early morning and late afternoon when possible. Consider permethrin-treated clothing for jungle and rural travel.
- Stay in accommodations with screens or air conditioning when in transmission zones.
- Empty standing water near your accommodation if you control the environment.
There is no widely available dengue vaccine for travelers in the United States. Qdenga (Takeda's TAK-003) is approved in some countries but is not yet routinely recommended for travelers by the CDC. Symptom-based prevention through mosquito control remains the standard. For a complete review, see our Dengue Fever in Travelers guide.
If you develop high fever, severe headache, eye pain, joint or muscle pain, or rash within two weeks of returning from Argentina, see a clinician promptly and mention your travel history.
Hantavirus in Patagonia: Rare but Important to Understand
Andes hantavirus pulmonary syndrome (HPS) is a rare but serious viral illness transmitted by exposure to the urine, droppings, or saliva of infected rodents, particularly the long-tailed colilargo mouse common in southern Argentina and Chile. Argentina averages roughly 100 to 130 reported HPS cases per year, with the highest concentration in the Patagonian provinces (Chubut, Rio Negro, Neuquen, Santa Cruz, Tierra del Fuego), per Argentine Ministry of Health surveillance. Person-to-person transmission has been documented for the Andes strain specifically, which is unusual among hantaviruses.
Travelers spending time in rustic cabins (refugios), rural estancias, abandoned buildings, or wooded areas in Patagonia carry a small but real risk. The 2018 Epuyen outbreak in Chubut province, which killed 11 people, prompted updated guidance for travelers and locals.
Practical hantavirus prevention:
- Avoid sleeping or eating in closed cabins that have been unoccupied for long periods. If you must, ventilate for at least 30 minutes before entering.
- Do not stir up dust in possibly contaminated cabins (sweeping dry, vacuuming). Wet down surfaces with a 10 percent bleach solution before cleaning.
- Store food in sealed rodent-proof containers when camping.
- Choose accommodations that are well-maintained and rodent-free. Mainstream hotels and lodges are extremely low risk.
- If you develop fever, severe muscle aches, and shortness of breath in the four to six weeks after returning from Patagonia, seek medical care immediately and mention your travel history. Early supportive care matters.
There is no vaccine for hantavirus and no specific antiviral treatment. Prevention through rodent avoidance is the only effective tool.
Vaccines for Argentina: A Region-by-Region Cheat Sheet
The CDC and WHO recommendations vary by destination within Argentina. The table below summarizes what most travelers need.
Routine vaccines deserve a second look. A 2025 PAHO measles bulletin documented sustained measles transmission in the Americas region, including imported cases into Argentina. Travelers who are not certain of their two-dose MMR status should get a booster before departure. Tdap should be current within the last 10 years.
Wandr's vaccine flow lets you book any of these online without calling pharmacies one at a time. Pick a partner pharmacy, a date, and a time, and the pharmacist administers your travel vaccines on-site. Yellow fever requires a designated authorized provider; our team will route you to the closest one.
Book your Argentina vaccines online.
Traveler's Diarrhea in Argentina: Lower Risk in Buenos Aires, Higher in Rural Provinces
Traveler's diarrhea (TD) affects roughly 10 to 40 percent of travelers to Argentina, depending on the region and itinerary, per CDC estimates. Buenos Aires sits at the lower end of that range, with safe tap water, modern restaurants, and effective food safety enforcement. Rural provinces, street food, and small-town asados sit at the higher end.
Common causes in Argentina:
- Enterotoxigenic and enteroaggregative E. coli (most common worldwide)
- Campylobacter, particularly from undercooked poultry or contaminated water
- Salmonella, occasionally from eggs or unpasteurized dairy products
- Norovirus, particularly on cruise ships and tour groups
Practical TD prevention:
- Tap water is generally safe in Buenos Aires, Mendoza, Cordoba, and most major cities. In rural areas and the Northwest, stick to bottled or filtered water. Use the same source for ice and brushing teeth.
- Choose busy restaurants with high turnover. The asado tradition is a good thing for food safety: meat is cooked thoroughly over open flame.
- Be cautious with street empanadas in hot weather, particularly at the end of a busy day when they have been sitting.
- Wash hands or use alcohol-based sanitizer before eating.
- Avoid unpasteurized dairy products in rural areas.
Most TD cases resolve in one to three days with hydration. Oral rehydration salts (ORS) are the single most useful item to pack. For moderate to severe cases (more than four loose stools per day, fever, blood in stool), a short course of azithromycin or ciprofloxacin can shorten illness from days to hours. Both are prescription-only in the United States.
Wandr's clinicians can prescribe a single course of TD antibiotic to keep in your travel kit. The prescription is sent to your local pharmacy for pickup before you leave. For a deeper review of which antibiotic is right for which destination, see our Ciprofloxacin vs Azithromycin for Traveler's Diarrhea guide.
Heat Illness, Sun, and UV: The Underrated Patagonia Risk
Argentina's UV index is high across most of the country, and Patagonia is particularly extreme. The Earth's protective ozone layer is thinner over southern South America, and clear-sky days in Patagonian summer routinely produce UV index values above 10, in the "very high" to "extreme" range. Travelers underestimate sun exposure on cool, windy hiking days more than on hot ones.
Practical heat and sun prevention:
- Apply broad-spectrum SPF 50 sunscreen to all exposed skin, including the back of the neck, ears, and tops of the hands. Reapply every two hours when active, more often when sweating or after water exposure.
- Wear a wide-brimmed hat and UV-blocking sunglasses. Glacier and snow exposure significantly increases reflected UV.
- The northern provinces (Salta, Jujuy, Tucuman, Mendoza) routinely hit 35 to 40 degrees Celsius (95 to 104 Fahrenheit) in summer. Plan early morning and late afternoon activity, and use midday for indoor stops.
- Carry electrolyte packets for any sustained outdoor activity. Aquarius and Powerade are widely available; ORS packets are stronger and pack flat in a daypack.
- Recognize early heat illness: lightheadedness, nausea, headache, cramping, heavy sweating that suddenly stops. Get to shade, hydrate, rest. Confusion or stopped sweating in the heat is a medical emergency.
Foot, Knee, and Overuse Injuries on Patagonia Treks
The most common reason a Patagonia traveler ends up seeing a clinician on a trip is not infectious. It is a foot, knee, or ankle problem. The classic trekking circuits in El Chalten (Laguna de los Tres, Cerro Torre viewpoint) and Torres del Paine on the Chilean side typically run 12 to 16 miles per day on rocky, uneven terrain with significant elevation change.
To prevent overuse injuries:
- Break in your boots before the trip. Two weeks of training hikes prevents most blister problems.
- Pack hydrocolloid blister bandages (Compeed), moleskin, and lubricant for hot spots. Treat hot spots before they become blisters.
- Use trekking poles on descents. They reduce knee strain by 25 percent or more on long downhills, per multiple sports medicine studies.
- Bring ibuprofen or naproxen for routine soreness. Use sparingly and never on consecutive days at altitude.
- Schedule rest days. A 4-day El Chalten itinerary with a rest day in the middle results in fewer injuries than 4 consecutive trekking days.
Travel Insurance for Argentina
Argentina's public hospital system provides emergency care free at the point of service to anyone, including foreign tourists. That sounds reassuring, but the care quality varies significantly between Buenos Aires and rural provinces, wait times in public hospitals can be long, and most travelers prefer private care for any non-trivial issue.
Private medical care in Argentina is high quality, particularly in Buenos Aires, but is paid out of pocket without insurance. More importantly, evacuation from Patagonia, Iguazu, or remote Northwest locations to a major hospital can cost tens of thousands of dollars without coverage.
Recommended coverage levels:
- Medical: at least $100,000 in coverage
- Medical evacuation: at least $250,000, particularly for Patagonia or remote travel
- Trip cancellation and interruption: matched to your trip cost
- Adventure activity rider: if you are trekking, climbing Aconcagua, skiing, or doing high-altitude activities
Get travel insurance for Argentina through Wandr.
Packing Checklist: Argentina
A region-tuned travel health kit for Argentina:
- Personal prescriptions in original labeled bottles, with extra supply in case of delay
- Acetazolamide (Diamox) for the Northwest, Mendoza high-altitude wineries, or Aconcagua approaches
- Single course of azithromycin or ciprofloxacin for traveler's diarrhea
- Oral rehydration salt packets (4 to 6)
- DEET 20 to 30 percent or picaridin repellent
- Permethrin-treated long sleeves and pants for jungle and rural travel
- Broad-spectrum SPF 50 sunscreen, lip balm with SPF
- Hydrocolloid blister bandages (Compeed), moleskin
- Wide-brimmed hat, UV-blocking sunglasses
- Anti-inflammatory (ibuprofen or naproxen)
- Antihistamine (loratadine or cetirizine for mild allergic reactions)
- Hand sanitizer (60 percent alcohol minimum)
- Thermometer
- Yellow fever vaccine certificate (if vaccinated; bring printed copy)
- Travel insurance documentation
When to See a Clinician Before Departure
Plan a pre-trip health review four to six weeks before your Argentina trip if any of the following apply:
- Your itinerary includes the Northwest, Mendoza high-altitude wine tours, or Patagonia trekking
- You are visiting Iguazu Falls or any province in the yellow fever zone
- You take prescription medications that need refills timed to your trip
- You have a chronic condition (cardiac, pulmonary, diabetes, immunosuppression) that interacts with altitude or remote-area travel
- You are pregnant or planning pregnancy (yellow fever and some antimalarials are contraindicated)
- You are 60 or older and considering yellow fever vaccination for the first time
Wandr's pre-trip health check is free and built specifically for travelers. A clinician reviews your itinerary, medical history, and current medications, then writes any prescriptions or vaccine recommendations needed before you fly. Vaccines are booked through our partner pharmacy network. Prescriptions are called in to your local pharmacy for pickup.
Start your free pre-trip health check.
FAQ
Do I need the yellow fever vaccine for Argentina?
Yellow fever vaccination is recommended by the CDC for travelers visiting Misiones, Corrientes, Chaco, Formosa, and forested areas of Salta and Jujuy. This includes Iguazu Falls on the Argentine side. The vaccine is not required for entry to Argentina from the United States. It must be given at least 10 days before departure and is contraindicated in pregnancy, significant immunosuppression, and infants under 9 months. Adults 60 and older should discuss the risk-benefit profile with a clinician before a first dose.
Is the tap water safe to drink in Argentina?
Tap water is generally safe in Buenos Aires, Mendoza, Cordoba, Bariloche, and most major cities. In rural areas, the Northwest, and small towns, use bottled or filtered water for drinking, ice, and brushing teeth. When in doubt, choose bottled water sealed at the factory.
Do I need malaria pills for Argentina?
Most travelers do not need malaria prophylaxis for Argentina. Per CDC, malaria risk is limited to a small area in the northeast (rural Salta and Jujuy provinces along the Bolivia border) and is rare. Travelers visiting only Buenos Aires, Mendoza, Cordoba, Iguazu, or Patagonia do not need antimalarials. Travelers headed to remote rural areas of the far northwest near the Bolivian border should ask a travel medicine clinician.
When is dengue season in Argentina?
Dengue transmission in Argentina peaks November through May, with the highest case counts typically February through April. The 2023 to 2024 season was the largest on record at more than 521,000 cases per PAHO, and transmission has stayed elevated through 2026. Travelers in the north, central provinces, and Buenos Aires metropolitan area during these months should use repellent and wear protective clothing during the day.
How serious is hantavirus in Patagonia?
Hantavirus is rare but serious. Argentina averages roughly 100 to 130 cases per year, concentrated in Patagonia. Risk for typical tourists is low, especially in mainstream hotels and lodges. Travelers staying in rustic cabins, working on rural estancias, or sleeping in long-unoccupied buildings carry a higher risk. There is no vaccine. Prevention is through avoiding rodent contact and not stirring up dust in possibly contaminated structures.
Do I need altitude medication for Salta or Jujuy?
Most travelers visiting the Salta and Jujuy highlands benefit from acetazolamide (Diamox). Sites like Salinas Grandes (11,300 feet), Cuesta de Lipan pass (above 13,800 feet), and Purmamarca (7,500 feet) regularly cause altitude sickness in unacclimatized travelers. Acetazolamide started one to two days before ascent reduces the risk. A clinician can prescribe it before your trip; Wandr's clinicians do this routinely for travelers heading to the Northwest.
How far in advance should I prepare for Argentina?
Plan four to six weeks before departure. That window covers vaccine immunity (yellow fever needs at least 10 days, hepatitis A needs 2 weeks for protection), prescription medication delivery, altitude medication review, and travel insurance setup. Travelers needing the full hepatitis B series should start months earlier or use the accelerated schedule.
Is Argentina safe for pregnant travelers?
Argentina is generally safe for pregnant travelers, with caveats. Yellow fever vaccine is contraindicated in pregnancy, which limits travel to the northeast jungle and Iguazu unless the trip can be deferred. Dengue and Zika risk increase the need for strict mosquito protection in northern provinces. Altitude trips above 8,000 feet are usually deferred during pregnancy. Discuss your itinerary with your obstetrician and a travel medicine clinician before booking.
Can I bring my prescription medications into Argentina?
Yes, with reasonable conditions. Pack medications in original labeled bottles with a printed copy of your prescriptions. Bring a doctor's letter listing each medication for controlled substances or injectable medications. Argentina does not have the strict pharmaceutical import rules of countries like Japan or Singapore, but customs officers may ask about large quantities of controlled medications.
Medical Disclaimer
This article is for general informational purposes and does not replace personalized medical advice from a licensed clinician who knows your medical history. Travel health recommendations change as outbreak data and CDC guidance evolve. Verify current recommendations with the CDC's destination page for Argentina (wwwnc.cdc.gov/travel/destinations/traveler/none/argentina) and a travel medicine professional before your trip. If you experience high fever, severe headache, shortness of breath, confusion, or other concerning symptoms during or after travel, seek medical care promptly and disclose your travel history.
Sources
- Centers for Disease Control and Prevention (CDC). Travelers' Health: Argentina. Accessed 2026.
- Pan American Health Organization (PAHO). Dengue Cases in the Americas, 2023 to 2025 Bulletins.
- World Health Organization (WHO). International Travel and Health: Yellow Fever Vaccination Requirements and Recommendations.
- Argentine Ministry of Health (Ministerio de Salud). Hantavirus Surveillance Reports.
- Wilderness Medical Society. Practice Guidelines for the Prevention and Treatment of Acute Altitude Illness, 2024 Update.
- CDC Yellow Book 2024. Travel-Related Infectious Diseases: Yellow Fever, Hepatitis A, Typhoid, Dengue.
Mark Karam, PA-C is a board-certified Physician Associate with emergency and urgent care experience and co-founder of Wandr Health.