Brazilian Cities Step Up Dengue Response as Heat and Rains Fuel Mosquito Boom

Overview

• Petrópolis held a Day D on March 6 with home visits, alerts by sirens and sound trucks, and guidance in commercial areas, parks and transit hubs.
• During the action, 10 health units offered dengue vaccination for ages 10–14, with the vaccine already available in 16 SUS rooms and now started for health workers in affected zones.
• Miracema reported a 330% rise in dengue cases, with 10 hospitalizations, four patients showing hemorrhagic signs and some requiring ICU care, and about 50 suspected cases under investigation.
• To curb spread, Miracema scheduled a March 13 citywide cleanup drive, advanced a second fumacê application cycle, and maintained sanitary blockades by endemic‑disease agents in areas with confirmed cases.
• Health officials warn that intense heat and sudden rains speed the Aedes aegypti life cycle and create breeding sites inside homes, where most foci are found and eggs can remain viable for up to a year; Petrópolis previously cut probable cases to 160 in 2025 with a low 0.11% LIRAa index.