Brazil's Federal District health officials warn of dengue surge as atypical rains hit

The Secretariat of Health of Brazil's Federal District (SES‑DF) has issued an alert that unusually heavy rain during the normally dry season could boost the breeding of Aedes aegypti, the mosquito that spreads dengue, chikungunya, Zika and yellow fever. Biologist Kenia Cristina de Oliveira explained that mosquito eggs can survive up to 400 days without water and hatch when even a small amount of rain falls, turning seemingly dry containers into breeding sites.

SES‑DF advises weekly inspections of homes and public spaces, covering removal of water‑holding items such as buckets, plant pots, animal water dishes and improperly covered tanks. Ongoing actions include the use of ovitraps, drone surveys of hard‑to‑reach sites, residual indoor spraying, larvicide‑dispersing stations, and community education. The “June without Dengue” campaign, launched on 18 June in Gama and Santa Maria districts, deployed health agents to visit households, advise residents, and coordinate collection of potential breeding containers.

Officials stress that cold winter temperatures lower mosquito activity but do not eliminate the risk, urging continued preventive measures throughout the season.