I can't for the life of me understand why your last statement isn't what the world is driving for at the moment. mRNA vaccines are easily(-ish) updated, so punch out an Omicron specific dose and get on with the regular single/dual (if needed) regime.
It seems strange we'd opt for 3-4-5 shots given the benefit of mRNA was its ease of creation and modification.
It seems strange we'd opt for 3-4-5 shots given the benefit of mRNA was its ease of creation and modification.