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How quickly can we sequence a mutated covid and develop a new vaccine?

How do mutations in covid correlate with ease of developing an updated vaccine, i.e. is the previous vaccine a good starting point? Will it take a year to respond to each annual mutation, rendering vaccines almost useless?

Presumably, there exist people with experience developing annual vaccines for influenza?

These are all rhetorical questions that I'm shouting into the e-wind, no worries.