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Respiratory Syncytial Virus (VSR)

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Health officials warn of rising respiratory infections across Brazil as Fiocruz data shows alert-level conditions in 18 states and the Federal District due to concurrent surges in influenza A and respiratory syncytial virus (VSR). The latest Fiocruz bulletin, covering March 29 to April 4, found rinovirus responsible for 40.8% of positive respiratory cases, influenza A for 30.7%, and VSR for 19.9%. At least 13 of the affected states show increasing notification trends in the coming weeks. In Minas Gerais, the Funed foundation reported influenza positivity reached 20% of tests between late March and early April — a shift of four to six weeks earlier than in 2025 — prompting Belo Horizonte and Contagem to declare respiratory health emergencies. Key Context VSR is highly contagious and a leading cause of acute viral bronchiolitis in children under two, with potential to progress to pneumonia or pneumothorax in severe cases. What is driving the early surge in influenza cases in Minas Gerais? Laboratory surveillance by Funed detected influenza A positivity reaching 20% of tests in late March to early April 2026, occurring four to six weeks earlier than the same threshold reached in May 2025, indicating an accelerated viral circulation pattern. Why are infants and older adults at highest risk from VSR? How does the co-circulation of influenza A and VSR strain health systems? Fiocruz warns of rising flu and VSR cases in 18 Brazilian states

by Dr Natalie Singh - Health Editor April 16, 2026

by Dr Natalie Singh - Health Editor April 16, 2026

Health officials warn of rising respiratory infections across Brazil as Fiocruz data shows alert-level conditions in 18 states and the Federal District due to concurrent surges in influenza A and …

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