Iguazú Falls needs a yellow fever check and repellent for the forest trails.
- Travel clinic CDC recommends medicine or vaccines for some areas · which ones
- No CDC travel notice for mosquito-borne disease
The CDC recommends yellow fever vaccine for travelers going to Misiones, the Argentine side, and to Iguaçu Falls on the Brazilian side. Dengue has been nearly absent since the 2023/24 epidemic, and the mosquitoes visitors complain about wait on the forest trails and at the boat landings.
Yes, mostly on the forest trails, at the boat landings and in hotel rooms with the windows open, in the morning and evening. The bigger planning item is yellow fever. The CDC recommends the vaccine for travelers going to Misiones province, the Argentine side, and to Iguaçu Falls on the Brazilian side, and it lists no malaria on either.
Yellow fever on both sides of the falls
What CDC says: on its Argentina page, "Vaccine is recommended for all travelers ≥9 months old going to Corrientes and Misiones Provinces." Its Brazil page lists Paraná state and adds that "vaccination is also recommended for travelers going to Iguaçu Falls," with "No malaria transmission at Iguaçu Falls." For both countries, "Country entry requirements: Vaccine is not required." What we suggest you do with this: book a travel-medicine appointment 4–6 weeks before departure and bring the whole route, Buenos Aires or Rio included.
Chikungunya advice differs by side. The CDC's Argentina page says chikungunya vaccination "is generally not recommended," while its Brazil page says "There is elevated chikungunya risk in Brazil," with vaccination to be considered for stays of about six months or more. Crossing to Ciudad del Este? Paraguay sets its own yellow fever rules, and our Paraguay briefing covers them.
A big dengue season in 2023/24, quiet since
Misiones had a large dengue epidemic in the 2023/24 season, with 15,327 cases by the health ministry's preliminary count. The 2025/26 season brought 1 laboratory-confirmed case, in a traveler, and 4 probable cases, according to Argentina's national epidemiological bulletin. The 2026/27 season started in August, and by mid-October Misiones had no cases from 48 notifications. Nationally, all 6 confirmed cases were in travelers, and the ministry says the early data can't predict how big the season will be. PAHO's October update warns that El Niño is intensifying ahead of South America's peak season.
On the Brazilian side, Paraná state had 631,735 probable dengue cases in the first half of 2024, according to Brazil's health ministry. No 2026 figures for Foz do Iguaçu or Puerto Iguazú were available. The dengue mosquito bites by day, so from February on, wear repellent all day on both sides.
The trail, the boat and the hotel room
The forested Sendero Macuco in the Argentine park has the strongest reputation for mosquitoes, and the Macuco Safari boat landing on the Brazilian side has one too. The open catwalks of the Upper and Lower Circuits and the Garganta del Diablo, soaked in spray, tend to draw fewer complaints. In town, mosquitoes tend to find rooms with open windows in the morning, the evening and at night.
Put repellent on over sunscreen before you enter either park, reapply after the boat ride soaks you, and add a fresh layer before the Sendero Macuco. Posters advise bringing a strong repellent from home. Keep hotel windows shut at night, or use screens and air conditioning. Our picaridin vs. DEET comparison helps you choose.
Where you're going
Garganta del Diablo & the circuits
The open catwalks over the falls, soaked in spray, tend to draw few bite complaints. They're in Misiones, so CDC's yellow fever advice applies here too.
Sendero Macuco
The forest trail in the Argentine park is the buggy one, with a reputation for many mosquitoes. Put on a fresh layer of repellent at the trailhead.
Puerto Iguazú
Misiones has had almost no dengue since its 2023/24 epidemic. Mosquitoes tend to find rooms with open windows in the morning, evening and at night, so keep them shut or screened.
Foz do Iguaçu & the Brazilian park
CDC recommends yellow fever vaccine for Iguaçu Falls and reports no malaria there. The Macuco Safari boat landing has a reputation for mosquitoes, so reapply before you board.
Our Argentina briefing covers Buenos Aires, Mendoza and Patagonia, and the Brazil briefing covers Rio and the Amazon.
The Iguazú kit
- Picaridin 20% travel sprays: odorless in the humidity and layers over sunscreen. Keep it in a zip bag for the boat ride. One 3.4 oz bottle covers about a week of daily use for one person.
- A full-size backup in the checked bag for a late-summer trip, when dengue season calls for repellent all day.
- A light long-sleeved shirt for the Sendero Macuco.
What travelers report
Paraphrased from TripAdvisor threads and reviews and linked so you can read them in full. None gives a year, and visitors disagree on which side of the falls is buggier.
- Iguazú National Park · March
Posters said mosquitoes are most active in the morning and evening and at night in hotel rooms. They advised DEET repellent reapplied often, keeping windows closed at night and bringing repellent from home, and named dengue as the main mosquito-borne concern. TripAdvisor ↗
- Macuco Safari boat tour (Brazilian side)
Boat-tour reviewers said there are tons of mosquitoes until you get into the boat. TripAdvisor ↗
- Iguaçu Falls (both sides)
Answering a question about current mosquito levels at the falls, a poster said the Argentine side was worse than the Brazilian side on a recent visit (carried over from the brazil entry). TripAdvisor ↗
One rule outlasts the trip. Any fever during or after your trip means a doctor visit, and you tell them you were at Iguazú Falls, and on which side.
Traveler questions
Do I need a yellow fever vaccine for Iguazú Falls?
The CDC recommends it for all travelers 9 months and older going to Misiones and Corrientes provinces, which covers the Argentine side, and its Brazil page recommends it for travelers going to Iguaçu Falls. Neither Argentina nor Brazil requires it for entry. Book a travel clinic 4–6 weeks before departure to talk it through, and bring the rest of your route.
Is there dengue at Iguazú right now?
Very little. Misiones had 15,327 cases in the 2023/24 epidemic, by the health ministry's preliminary count, then 1 laboratory-confirmed case, in a traveler, plus 4 probable cases in 2025/26. By mid-October 2026 the province had none in the new season. The ministry says the early data can't predict the season's size, and risk usually builds from February, so check the latest bulletin before a late-summer trip.
Which side of the falls has more mosquitoes?
Visitors disagree, and it likely depends on the week. The spots with the strongest reputation are the Sendero Macuco on the Argentine side and the Macuco Safari boat landing on the Brazilian side, while the open catwalks tend to be milder. Wear repellent on both sides.
Do I need malaria pills for Iguazú?
The CDC recommends no malaria medicine for either side. Its Argentina page lists no malaria, and its Brazil page says there is no malaria transmission at Iguaçu Falls. The travel-clinic question for the falls is yellow fever.
Sources
Health authorities, surveillance reports and news coverage of official bulletins used for this briefing, last checked October 2026. Traveler reports are linked where they appear. This page summarizes public-health guidance and is not medical advice.
- CDC destination page for travelers
- CDC destination page for travelers
- Government source (argentina.gob.ar)
- Government source (argentina.gob.ar)
- Government source (argentina.gob.ar)
- Government source (gov.br)
- Pan American Health Organization (PAHO)
- CDC Travel Health Notice
- sapl.fozdoiguacu.pr.leg.br
- Pan American Health Organization (PAHO)
- Pan American Health Organization (PAHO)
- European Centre for Disease Prevention and Control