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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.

유형 계통수표준 Newick + NHX extensions엔진 schematex-phylo업데이트됨 2026. 9. 24.
Influenza A Seasonal Strains
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요청 내용

“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.”

그렇다면Add an H3N2 2024 strain.Change the reference year to 2026.
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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.

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자주 묻는 질문

자주 묻는 질문

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.