The Rio Negro is known for few mosquitoes. CDC's malaria advice covers it anyway.
- Travel clinic CDC recommends medicine or vaccines for some areas · which ones
- No CDC travel notice for mosquito-borne disease
Rio Negro lodge trips from Manaus have a reputation for fewer mosquitoes than visitors expect. The CDC still lists all of Amazonas state for malaria prevention medicine and recommends yellow fever vaccine, so this trip starts at a travel clinic.
Fewer than most visitors expect, especially on the black-water Rio Negro. The CDC still lists all of Amazonas state, Manaus and the Rio Negro lodges included, for malaria prevention medicine and recommends yellow fever vaccine for travelers going there. A lodge's reputation doesn't change either recommendation.
Malaria and yellow fever
What CDC says: malaria transmission occurs in "All areas in the states of Acre, Amapá, Amazonas, Rondônia, and Roraima," and the CDC lists atovaquone-proguanil, doxycycline, mefloquine and tafenoquine as prevention medicines, with chloroquine resistance. Yellow fever vaccine "is recommended for travelers ≥9 months old going to the states of" a list that includes Amazonas, and under entry requirements, "Vaccine is not required." What we suggest you do with this: book a travel-medicine appointment 4–6 weeks before departure with your lodge name and dates, and bring the rest of your Brazil route. Our malaria-zone checklist covers the rest.
Malaria is still common in the state. Amazonas's health surveillance agency, FVS-RCP, counted 24,437 new cases in 2026 through July, 25% fewer than in the same period of 2025, with transmission concentrated in interior municipalities. It marked July as the start of the high-transmission season, when the falling rivers leave pools where malaria mosquitoes breed. Most cases are P. vivax. Malaria mosquitoes bite from dusk to dawn, so dusk canoe trips, night caiman spotting and jungle overnights are the exposure.
Black water, fewer mosquitoes
The Rio Negro's black water has a reputation for few mosquitoes. Tour operators and lodge descriptions credit the river's acidity for hindering breeding, and many visitors' reviews back up the light biting. Fewer is not none, though. Reviewers at Anavilhanas Lodge mostly report few bites but still meet mosquitoes on forest hikes, and lodges on the main Amazon south of the Meeting of the Waters have a reputation for more.
Put repellent on again before a dusk canoe trip or a night walk, wear permethrin-treated long sleeves and trousers in the forest, and sleep under the lodge's net or in a screened room.
Dengue and Oropouche in the city
In Manaus itself the day-biting Aedes mosquito is the dengue risk, so repellent goes on over sunscreen in the morning. Arbovirus notifications in Amazonas were 43.6% below 2025 through September, and the city had more than any other municipality, according to FVS-RCP. Oropouche, spread mainly by a biting midge, has nearly disappeared since Amazonas led Brazil's 2024 outbreak, with one confirmed case from January to September 2026. FVS-RCP's advice against it is to avoid forest and riverbank areas, especially from 9 a.m. to 4 p.m. Pregnant travelers should discuss Zika and Oropouche with a healthcare provider.
When to go
Manaus is humid in every month, so no season is bite-free. Malaria transmission climbs as the rivers fall, from about July. For dengue, a model cited by Brazil's health ministry expects the North region's 2026/27 season to come in at or below 2025's, with a strong El Niño adding about 10%.
Where you're going
Scores are for a visit in any month.
Manaus & the Meeting of the Waters
The city had the most arbovirus notifications in Amazonas in 2026, so daytime repellent matters here. It's inside the CDC's all-Amazonas malaria area.
Anavilhanas & Novo Airão
Black-water archipelago upriver of Manaus. Lodge reviewers report few mosquitoes, though some on forest hikes, so pack long trousers and repellent.
Lago Mamori & Juma lodges
The white-water side, which forum posters call buggier than the Rio Negro. Expect more mosquitoes at dusk and plan on the full forest routine.
Upper Rio Negro: Barcelos & São Gabriel
Remote fishing and expedition country far upriver. These towns led the state's malaria counts in early 2024, according to press reports, so name them at the travel clinic.
The Brazil briefing covers Rio and the falls. Adding the wetlands? Our Pantanal briefing covers the dry and wet seasons there.
The Amazon lodge kit
- Picaridin 20% travel sprays: odorless in the humidity and layers over sunscreen. One 3.4 oz bottle covers about a week of daily use for one person.
- Permethrin 0.5% for lodge clothes: treat long sleeves, trousers and socks at home 48 hours before you fly. Treated fabric repels and kills insects on contact through several washes. It goes on clothing, never on skin.
What travelers report
Paraphrased from TripAdvisor reviews and threads and linked so you can read them in full. Neither gives a year, and a light-biting trip doesn't change the CDC's malaria advice.
- Manaus area jungle trip
A returning traveler titled their report 'Great Trip. Few Mosquitoes.' after a jungle trip from Manaus. TripAdvisor ↗
- Amazon Ecopark Jungle Lodge, near Manaus
A guest described the stay as a mosquito-free jungle experience. TripAdvisor ↗
One rule outlasts the trip. Any fever during or after the trip, even weeks or months later, means a doctor visit, and you tell the doctor you were in the Amazon. Malaria can take longer to show up than dengue.
Traveler questions
Do I need malaria pills for a Rio Negro lodge?
The CDC lists all areas of Amazonas state, including Manaus and the Rio Negro lodges, as malaria transmission areas and lists prevention medicines for them. Which medicine fits you is a decision for a travel clinic 4–6 weeks before departure. A lodge's reputation for few mosquitoes doesn't change the CDC's listing.
Is it true the Rio Negro has no mosquitoes?
It has fewer, by reputation. Tour operators and lodges credit the black water's acidity, and many visitors report light biting, but reviewers still meet mosquitoes on forest hikes. Malaria mosquitoes bite from dusk to dawn, so a quiet afternoon on the river says little about the night.
Do I need a yellow fever vaccine for Manaus?
Brazil doesn't require it for entry. As health advice, the CDC recommends it for travelers 9 months and older going to Amazonas state, which includes Manaus. Raise it at the same travel-clinic visit as malaria, 4–6 weeks before departure.
When is the best time to visit Manaus for mosquitoes?
No month is bite-free, since Manaus is humid all year. Malaria transmission rises as the rivers fall, and Amazonas's health agency marked July as the start of the high-transmission season in 2026. Whatever the month, the travel-clinic visit and the dusk routine stay the same.
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
- Government source (fvs.am.gov.br)
- Government source (fvs.am.gov.br)
- Government source (fvs.am.gov.br)
- Government source (fvs.am.gov.br)
- Government source (gov.br)
- Government source (gov.br)
- Pan American Health Organization (PAHO)
- Government source (gov.br)
- CDC Travel Health Notice
- portalamazonia.com
- redeondadigital.com.br
- lastfrontiers.com
- journeylatinamerica.com
- liveaboard.com
- European Centre for Disease Prevention and Control
- Pan American Health Organization (PAHO)
- Pan American Health Organization (PAHO)
- Pan American Health Organization (PAHO)
- Government source (gov.br)
- Government source (gov.br)
- Pan American Health Organization (PAHO)
- European Centre for Disease Prevention and Control
- Pan American Health Organization (PAHO)
- World Health Organization