Part of the problem was a mismatch between the influenza strains circulating and the vaccine available. Here’s how annual flu shots are formulated.
Articles on Flu forecasting
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New genetic technologies are letting us look at flu evolution right where it starts: within individual people, while they’re sick.
Flu virus mutates so quickly that one year’s vaccine won’t work on the next year’s common strains. But a new way to create vaccines, called ‘rational design,’ might pave the way for more lasting solutions.


