To assess the circulation of Oropouche, Mayaro, West Nile, and St. Louis encephalitis viruses, we tested samples from 824 patients with acute febrile illness, 3,484 mosquitoes, and 113 nonhuman primates from northern Minas Gerais, Brazil. All samples were negative for dengue, Chikungunya, and Zika virus. One imported Oropouche virus infection was detected.
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Ferreira et al. (2026) studied this question.
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