Fiocruz Study Shows a Relationship Between Dengue and the Rare Guillain-Barré Syndrome, Which Affects Peripheral Nerves

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In 2024, Brazil experienced the largest dengue epidemic in its recent history, with about 6.5 million probable cases and more than 5.8,000 deaths in the country. In 2025, there was a significant reduction, with about 1.6 million probable cases until November, but the circulation of the high virus. By 2026, Fiocruz's projections indicate that dengue will still affect many people in Brazil, with approximately 2 million cases.