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public health · virology

Influenza seasonal strains

This illustrative chronogram separates selected H1N1 and H3N2 influenza A strains by season. The coloured clades make the two subtypes easy to distinguish, while the years-before-2025 scale makes the temporal framing explicit. It is a compact example of how a time-calibrated tree can organize a small selection of strains.

Tipo Albero filogeneticoStandard Newick + NHX extensionsMotore schematex-phyloAggiornato 24/09/2026
Influenza A Seasonal Strains
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La richiesta

“Create an illustrative 2025 influenza A chronogram with H1N1 strains from 2021 and 2022, H3N2 strains from 2021, 2022 and 2023, highlighted H1N1 and H3N2 clades, and a years-before-2025 scale.”

Prova alloraAdd an H3N2 2024 strain.Change the reference year to 2026.
Cosa contiene questo disegno

Leggi le decisioni che ne stanno alla base.

01Season labels

Include the strain subtype and season.

02Clades

Highlight H1N1 and H3N2 separately.

03Time scale

State the reference year on the chronogram.

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

Sfoglia tutti i modelli di tipo albero filogenetico →

FAQ

Domande frequenti

What does the seasonal label show?

It identifies the subtype and year used for each selected strain.

Why use a chronogram?

A chronogram makes the time framing of a strain comparison explicit.

Is this surveillance evidence?

No. It is an illustrative example and does not replace a sourced surveillance analysis.