Overview
- National surveillance shows a modest, localized uptick in influenza A(H3N2) with overall respiratory virus circulation remaining low and levels still within seasonal expectations.
- Six new H3N2 J.2.4.1 (K) cases were detected in the latest week, with 53 confirmed between December 18 and January 30 across 17 jurisdictions concentrated in the Centre and South.
- Pertussis reached 99 confirmed cases in the first three weeks of 2026, an incidence of 0.21 per 100,000 and the highest for this period since 2019, with health authorities urging improved vaccination coverage.
- Hantavirus recorded three new cases in the latest week, totaling 14 so far in 2026 and 73 since July 2025, which keeps the country above the outbreak threshold and warrants heightened clinical suspicion in affected areas.
- SARS-CoV-2 circulation remains stable with two hospitalized cases and no RSV notifications, while dengue saw no new cases in Week 04 and stands at 18 for the 2025/2026 season, continuing a marked decline from 2023–2024 peaks.