Influenza viruses are Orthomyxoviridae. Types A and B drive most human seasonal disease; A also has animal reservoirs. Influenza A has eight RNA segments, which is why reassortment can create new HA/NA subtype combinations.
The 1918 H1N1 pandemic killed tens of millions worldwide — a benchmark for later pandemic planning. In recent decades, seasonal A viruses in people have been mainly H1N1 and H3N2, plus influenza B lineages.
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Influenza viruses are Orthomyxoviridae. Types A and B drive most human seasonal disease; A also has animal reservoirs. Influenza A has eight RNA segments, which is why reassortment can create new HA/NA subtype combinations.
The 1918 H1N1 pandemic killed tens of millions worldwide — a benchmark for later pandemic planning. In recent decades, seasonal A viruses in people have been mainly H1N1 and H3N2, plus influenza B lineages.
Each copy round adds mutants. Most fail. A few drift the surface enough to matter next winter. Some cause severe disease but spread poorly between people so far. Risk is watched, not a score for panic.
Flu can open the door to bacterial pneumonia, a historic killer in 1918 and still a worry. Identity is a family of RNA viruses named for their HA and NA surfaces when they are type A.
This is education from the atlas. It does not diagnose and does not prescribe a dose. It does not replace the full topic page.
Next question: Mutation and variants · Open the topic: Influenza
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