You need to make sure you're targeting the right part of the virus. If you pick the wrong protein, your jab could prove less effective than hoped.
If you could manufacture vaccines more quickly, you could make more accurate predictions nearer to flu season, relieving the need for some of this guesswork.
Researchers hope that a single mRNA shot could one day target 20 or more strains of flu at once, potentially bringing about a 'universal' flu vaccine.
We don't yet know how long-lasting the immunity they produce is. All flu jabs have a waning immunity problem; your protection could decline by around 10 percent monthly.
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