PUBLIC HEALTH

Influenza seasonal strains

Influenza seasonal strain tree

UPDATED 2026-09-24
TYPEPhylo
EXAMPLEInfluenza seasonal strains
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CASE ANALYSIS

Scenario

A public-health presentation needs a simple seasonal strain comparison.

Key decisions

  • Season labels: Include the strain subtype and season.
  • Clades: Highlight H1N1 and H3N2 separately.
  • Time scale: State the reference year on the chronogram.

When to reuse this

Use this as an illustrative communication aid; surveillance conclusions need source data and analysis.

FAQ

Frequently asked questions

What does the seasonal label show?01
It identifies the subtype and year used for each selected strain.
Why use a chronogram?02
A chronogram makes the time framing of a strain comparison explicit.
Is this surveillance evidence?03
No. It is an illustrative example and does not replace a sourced surveillance analysis.
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