Overview
- The Health Ministry identified the K subclade (J.2.4.1) in Pará during epidemiological week 49 and also detected subclade J.2.4.
- Fiocruz reports the confirmed K case was imported in a woman arriving from Fiji, sampled in Belém on November 26, with no evidence of local transmission to date.
- WHO and PAHO cite a rapid global rise in K detections since August, now reported in more than 34 countries, with earlier‑than‑usual flu activity in parts of Europe, North America and Asia.
- Brazil’s surveillance notes growth or persistence of Influenza A hospitalizations in Amazonas, Pará, Tocantins, Bahia, Piauí, Ceará and Santa Catarina, with a gradual decline in the Southeast.
- Authorities report no increase in clinical severity or new symptoms; preliminary estimates suggest vaccines reduce hospitalizations by about 70–75% in children and 30–40% in adults, antivirals remain effective when started early, and the 2026 formulation was updated to cover K.