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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ElwoodBlues · M

For Moderna, the booster is a smaller dose; for Pfizer all three are the same.

Just to put it in context, How many tetanus boosters have you had in your life? Did you know the polio vaccine requires 4 doses? Two doses is only 90% effective. Some vaccines mandated for school kids require more.

The MMR vaccine, combining vaccines for measles, mumps, and rubella, was released 50 years ago in 1971. By 1980, all US states had adopted requirements for mandatory MMR vaccinations for public school; these days it's a 2-dose regimen.
The Tdap vaccine - a follow-on the early childhood 5-dose DTaP - was released in 2005, and, like MMR, is required in all US states for public school.
https://www.healthline.com/health-news/vaccine-mandates-in-schools-arent-new-theyve-been-used-since-1850#A-history-of-vaccine-mandates-in-schools

All these years of multi-dose vaccine mandates (6 vaccines, 3 per shot, 2 shot & 5 shots regimens) for children have me wondering: why has vaccination against a 7th disease, Covid become politicized while the first 6 were fine? What's going on here?

ArishMell · 70-79, M

@ElwoodBlues That's a good question. I've often wondered that, but when you put it to determined anti-vaccination people they tend to shy away from trying to answer it.