Cases of chikungunya and zika fall in Brazil, but most risk clusters exhibit an upward trend
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOAnalysis of occurrence and co-occurrence patterns shows the highest-risk clusters of chikungunya and zika in Brazil spreading from the Northeast to the Center-West and coastal areas of São Paulo state and Rio de Janeiro state in the Southeast between 2018 and 2021, and increasing again in the Northeast between 2019 and 2021.