Dengue in Brazil: alert level by state and city
See the dengue alert for the capital and the largest cities in each state, with the case trend and guidance from the Ministry of Health. Weekly data from InfoDengue.
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Alert data: InfoDengue (Fiocruz and Fundação Getulio Vargas) · Health guidance: Ministry of Health
Dengue is transmitted by the mosquito Aedes aegypti, and the risk changes from one region to another and from one week to the next. To track this, RaisLife gathers the alert level that InfoDengue, a project of Fiocruz and the Getulio Vargas Foundation, calculates for the capital and the four largest cities in each state, combining case reports with weather data.
- —in green
- —in yellow
- —in orange
- —in red
Map of the states
States: status of the capital
No state has its capital at this level right now.
How to read the alert levels and the trend
- GreenWeather conditions not favorable to transmission (temperature or humidity) and low viral activity. This does not mean there are no cases.
- YellowWeather conditions favorable to transmission (temperature or humidity) and viral activity present, with at least 1 case.
- OrangeRising incidence, with at least 2 weeks of Rt above 1, but still within historical levels.
- RedHigh incidence by the municipality's historical standards, above 90% of the threshold calculated with the Moving Epidemic Method (MEM).
InfoDengue calculates the levels for each municipality from case reports and climate data; the description of each level, using the terms above, is in the InfoDengue glossary, and “Rt” is the disease's reproduction number. The information is organized by epidemiological week: by international convention, according to the the Health Ministry's Sinan notification calendar, weeks are counted from Sunday to Saturday, and the first week of the year is the one containing the most days of January. So “39/2026” is the 39th epidemiological week of 2026. The estimated cases are the week's cases after correcting for notification delays, and the incidence is the estimated number of cases per 100,000 residents for the week. Estimated cases are a statistical estimate and are not the same as individually confirmed cases.
A trend is RaisLife's reading of the estimated cases: it compares the total for the last two weeks with the two weeks before and shows a rise when the number went up 25% or more, a drop when it fell 20% or more, and stable in all other cases. When the four weeks add up to fewer than 100 estimated cases, the panel says "few cases," because with a small number, a change from one week to the next tells you little. Since the most recent weeks are the most likely to be revised, the trend can also change.
What the public should know, according to the Ministry of Health
A city's alert describes the situation in the area; it does not say whether any one person is sick. What applies to each person is the guidance from the Ministry of Health, which RaisLife summarizes here from the official dengue page, checked on Oct 14, 2026.
How the disease presents
According to the Ministry of Health, dengue usually starts suddenly, with a high fever of 39 °C to 40 °C, along with at least two of these signs: headache, exhaustion, muscle or joint pain, and pain behind the eyes. Nausea and red spots on the body are also common.
Symptoms can vary from person to person, and a fever does not always reach these levels. If in doubt, seek medical care.
Warning signs
The moment that calls for the most attention, according to the Ministry, is when the fever drops, between the third and seventh day of illness, when severe abdominal pain, frequent vomiting, dizziness or a feeling of fainting, trouble breathing, bleeding from the nose, gums or stool, fatigue and irritability may appear. If there is bleeding or any of these signs, seek emergency care immediately.
When to seek care
Anyone with a sudden high fever and these symptoms should seek medical care without delay. Extra caution applies to pregnant women, children up to 2 years old, people over 65 and those living with conditions such as diabetes and hypertension, groups the Ministry identifies as being at higher risk of complications. The advice is not to self-medicate: there is still no specific treatment for dengue, and follow-up, which includes hydration, rest and returning for reassessment, should be set by a health professional.
How to reduce the risk at home
Control of the Aedes aegypti is, according to the Ministry, the main form of prevention. In practice, that means getting rid of anything at home that collects standing water and could become a breeding site, keeping water tanks and other reservoirs tightly sealed, clearing gutters, flat roofs and drains, and installing window screens. The Ministry also mentions repellent in areas where the disease is spreading; anyone who uses it should follow the label.
The Ministry also notes that the dengue vaccine was added to Brazil’s public health system (SUS) on December 21, 2023, but only as a complement: even with the vaccine, mosquito control remains the main method of prevention. To find out whether you can be vaccinated, contact your local health clinic or your municipal health department.
Public information; it does not replace an assessment by a health professional. This content does not provide a diagnosis or recommend treatment. If you have a fever or other symptoms, go to a health clinic.
Where the numbers and guidance come from
Alert levels, estimated cases and incidence come from InfoDengue, a system run by Fiocruz and the Getulio Vargas Foundation that cross-references case notifications from Sinan, the Health Ministry’s reporting system, with climate data. RaisLife keeps a copy of these figures and updates it often, with each new epidemiological week released, always stating the week they refer to.
The guidance on symptoms, warning signs and prevention follows the dengue page of the Ministry of Health, checked on Oct 14, 2026. Each municipality's population is the estimate from IBGE, Brazil's statistics institute, for 2026, and the choice of cities tracked (the capital and the four largest in each state) is RaisLife's.
Public information; it does not replace an assessment by a health professional. This content does not provide a diagnosis or recommend treatment. If you have a fever or other symptoms, go to a health clinic.