Genomic evidence shows sustained Oropouche virus transmission in Rio de Janeiro, suggesting the need for enhanced surveillance.
Following its introduction in early 2024, OROV persisted in Rio de Janeiro State by spreading through short-distance movements among municipalities with high forest cover and agricultural areas. The sustained multi-year OROV transmission in the Atlantic Forest biome highlights the potential for establishment of endemic cycles beyond the Amazon region and the need for enhanced surveillance in extra-Amazonian areas, where OROV will evolve in a different ecosystem.
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Arantes et al. (2026) studied this question.
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