What is the Difference Between The First 2 Covid Injections and the Booster(s)?

I cannot find any discernable difference.

If there is no difference would you have taken any injections if you knew you had to take up to 4/5 in a year and a half?

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ArishMell · 70-79, M

You should not notice any difference in the vaccinations themselves, except by less chance of catching Covid, and if you do, less chance of serious results.

When you think back, you will recall having other innocculations in two or more doses, so this one is not unique in booster or regular doses.