2/9 The virus has a dark history. First detected in 1996, H5N1 spread globally through migratory waterfowl, mutating into diverse clades.
Clade 2.3.4.4b emerged in 2016, reaching Canada by 2021—with an ominous new trait: infecting marine and terrestrial mammals.
#AvianFluenza #ViralEvolution
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