That wait is for most or all vaccines, including pre COVID times. Any parent will be familiar with that instruction to wait after the shot.
And you're being deliberately obtuse. Like most medicines, vaccine injections have other ingredients like preservatives, the carrier fluid, etc. People can be allergic to the other ingredients but not the mRNA/TDAP/Influenza/whatever vaccine.
And you're being deliberately obtuse. Like most medicines, vaccine injections have other ingredients like preservatives, the carrier fluid, etc. People can be allergic to the other ingredients but not the mRNA/TDAP/Influenza/whatever vaccine.