Pandemic years are when reassortment or a new zoonotic jump becomes visible. Most evolution is quieter winter drift.
SARS-CoV-2 added real-time genome dashboards. The public learned lineage names that influenza scientists had used more quietly for decades.
Timeline
A severe influenza pandemic showed how a novel antigenic package can sweep a world without modern vaccines.
A reassortant H2N2 subtype replaced H1N1 in humans — a classic antigenic-shift pandemic.
Another HA shift produced H3N2, still a major seasonal actor after decades of drift.
Theoretical work framed replicators as error-prone clouds, later a standard RNA-virus metaphor.
Human cases of avian H5N1 raised zoonotic-shift fears; control focused on birds and exposure, not home experiments.
A triple-reassortant H1N1 spread globally; seasonal H1N1 was displaced. Vaccines were updated the following season.
A new coronavirus spread worldwide. Genome sharing made lineage tracking a public dashboard.
WHO VOC labels marked lineages with different spread and immune-escape profiles in 2021–22.
History here is surveillance history, not a manual for making viruses.
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