The first Larval Density Assessment (ADL) for 2026, conducted in January, identified regions in the city with a high concentration of Aedes aegypti mosquito larvae, which transmit diseases like dengue, zika, chikungunya, and yellow fever. The city's Vector Control Division of the Municipal Health Secretariat mapped these neighborhoods and mobilized teams to strategically intensify containment actions and control breeding sites. The Chácara Flora area was particularly affected, with 398 identified larval breeding sites across 34 blocks inspected.

To evaluate the risk level, the Breteau Index (IB) was calculated, which considers the ratio of containers with larvae to the number of inspected properties. The Ministry of Health recommends an acceptable IB of 1 or lower. An IB between 1 and 3.9 indicates a warning situation, while a score above 4 suggests a risk of outbreaks. The findings from the larval report lead to urgent public health responses to mitigate the risks associated with these high larval densities, aiming to prevent potential health crises.

Through coordinated efforts, health authorities seek not only to control the mosquito population but also to educate the community on preventive measures. By targeting hotspots identified in the report, they aim to implement effective interventions, reduce the potential for dengue outbreaks, and safeguard public health in the affected regions.