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Influenza activity rising across the Western Pacific

The WHO Western Pacific respiratory-viruses surveillance bulletin for epidemiological week 37 reports influenza positivity rising from 14% in week 35 to 16% in week 37. Among influenza detections, A(H3) accounted for 48.4%, A(H1N1)pdm09 for 26.7%, and B(Victoria) for 23.8%. Activity increased across all transmission zones except Oceania, Melanesia and Polynesia. This is a regional surveillance signal and does not indicate uniform activity in every country.

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Location
WHO Western Pacific Region
Regional representative point
First seen
September 24, 2026
Last verified
September 25, 2026

Markers use representative points at the country or regional level, not exact incident locations. Placement indicates the affected area, not a precise site.

What changed since the prior scan

Added September 25 from the WHO Western Pacific week-37 surveillance bulletin: influenza positivity up from 14% (week 35) to 16% (week 37), with A(H3) predominating (48.4% of detections) and increases in all transmission zones except Oceania, Melanesia and Polynesia.

History

  1. First seen (source)

    First reported by the primary source. External event date, not a TiPH publication date.

  2. Added to the desk

    Added to the Global Signal Desk in the September 25 scan from the WHO Western Pacific week-37 surveillance bulletin.

Primary sources

Who works on this?

Events like this are answered by teams across public health. These are real profession types that respond to this kind of event — not people assigned to it.

  • Epidemiologist

    Tracks how and where disease spreads and estimates risk to populations.

  • Public health analyst

    Synthesizes data and evidence to inform decisions.

  • Health communication specialist

    Turns technical findings into clear, trustworthy public guidance.

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Corrections & updates

This record is reverified against its primary sources on a twice-daily scan. When the evidence changes, the record changes and the change is logged in the review record — including signals we remove. This is situational awareness, not clinical or travel advice.

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