Mosquito-borne diseases reported in Mato Grosso and Mato Grosso do Sul

Health authorities in Brazil are monitoring the spread of mosquito-borne diseases across the central-western region. In the municipality of Três Lagoas, Mato Grosso do Sul, there have been 113 confirmed cases of diseases transmitted by the Aedes aegypti mosquito in 2026. This total includes 87 cases of dengue, 25 of chikungunya, and one case of zika. While 683 suspected cases were reported since the start of the year, 571 were dismissed following investigation.

In the neighboring state of Mato Grosso, Ministry of Health data indicates 12,415 probable cases of dengue and 14 deaths recorded in 2026. Although the number of cases shows a significant reduction compared to the same period in 2025—with a 67% decrease in probable cases between January and May—health officials remain cautious. The incidence rate stands at 319.3 cases per 100,000 inhabitants, and while the overall lethality rate is 0.11%, it rises to 3.23% among patients who develop severe forms of the disease.