Brazil

Brazil's One Health priorities center on vector-borne disease, particularly dengue, Zika, and chikungunya, and on zoonotic surveillance across its enormous agricultural and livestock sector, including active monitoring of H5N1 activity in wild bird and poultry populations.

Brazil experienced its most severe dengue epidemic on record in recent years, with climate-driven range expansion of Aedes mosquitoes pushing transmission into previously low-risk southern regions. Non-communicable disease and urban violence-related injury also represent significant and growing health system burdens.

Brazil's Unified Health System, the Sistema Único de Saúde, provides universal coverage across a highly decentralized structure, with municipalities holding significant service delivery responsibility and correspondingly wide variation in capacity and quality.

Deforestation in the Amazon basin is directly linked to zoonotic spillover risk and regional climate disruption, while urban environmental health challenges, including water and sanitation gaps in rapidly growing peripheral urban areas, persist alongside strong core infrastructure in wealthier regions.

Brazil's globally significant poultry and cattle export industries maintain strong formal veterinary and biosecurity systems, though the country's vast agricultural frontier along the Amazon periphery presents ongoing zoonotic surveillance challenges.

Climate-driven expansion of vector-borne disease range into previously temperate southern regions is Brazil's most consequential and best-documented climate health risk, alongside increasing frequency of severe flooding events in the south and drought in the Amazon and northeast.

Brazil maintains substantial genomic surveillance and vaccine manufacturing capacity through institutions like Fiocruz, representing a significant health security and regional manufacturing asset for Latin America.

Strengthening dengue and arbovirus response, including expanded vaccination campaigns, and continued investment in the Unified Health System's primary care network are current stated federal priorities.

As an upper-middle-income country, Brazil finances the large majority of its own health system domestically, while remaining an active partner in regional health security cooperation and a growing South-South cooperation provider itself.

PAHO, the World Bank, and regional cooperation mechanisms across Latin America are Brazil's primary external health partners, alongside bilateral scientific cooperation with the European Union and other partners on arbovirus and climate health research.

The gap between Brazil's strong vaccine and surveillance science and its municipal-level vector control and health system capacity is the most consistent constraint on translating research strength into faster outbreak containment.

What Brazil's dengue response can teach cities elsewhere preparing for climate-driven vector expansion is specific: strong national science doesn't substitute for municipal-level vector control financing and workforce, and closing that gap should be a design priority for any city anticipating a similar climate-driven shift.