There is no easy way to prove the viruses in Britain originated in Australia without detailed genetic sequencing

Britain’s media have made much of the “Aussie flu” sweeping across the northern hemisphere but is there evidence the land down under is to blame?

There are a few things we know. Flu viruses circulate all year around, all over the world, and they are constantly evolving through mutation. This means even viruses of the same subtype can be slightly different, and so vaccines against the subtype won’t necessarily work on newly mutated forms.

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