Quote:t's difficult to create a universal vaccine, because the strains of flu that are prevalent one year aren't necessarily going around the next year — and even if they are the same strains, the virus is so quick to evolve, it's possible the current mutation can resist the old vaccine.
Seeing the success of targeting the stem of the HA protein rather than the head was a big step in the the right direction. If it works for one or more flu strain, then it's possible it could cover a number of other strains as well, leading to a universal vaccine that doesn't have to be taken every year.
The Guardian reports human trials are at least three years off. And until those begin to happen, we won't know for sure if these vaccines will have the same effect.
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