https://msdh.ms.gov/msdhsite/index.c...nts_-_2020.pdf

You had to have 5 doses of DTap, 4 doses of polio, 3 doses of Hepatitis B, 3 doses of MMR, and 2 doses of Chickenpox.

I'm not aware of any single dose vaccine, why do you expect one for Covid?

And the rest of your post is made up. And Pfizer has full approval, with more data than any other vaccine to get approval.