That’s because the animal trials were successful. They worked with mice and rhesus macaques.
https://www.medpagetoday.com/infectiousdisease/covid19/87788
https://www.nature.com/articles/s41586-021-03275-y
Very successful trials. Very successful vaccines.
Successful Successful Successful
https://www.medpagetoday.com/infectiousdisease/covid19/87788 says:
Seven of eight vaccinated monkeys in both dosing groups had no detectable virus in the lungs two days afterwards, whereas viral RNA was found in lungs of all eight monkeys receiving placebo, according to Barney Graham, MD, PhD, of NIAID, and colleagues.
A "study" with 24 TOTAL participants (experimental + control together).
That's not even enough for a CNN push-poll glorifying Dementia Joe.
Fifty per cent virus-neutralization GMTs—measured by a SARS-CoV-2-neutralization assay27 (rather than a pseudovirus-neutralization assay)—were detectable in the sera of most BNT162b1-immunized macaques by day 21 after dose 1, and in all BNT162b2-immunized macaques by day 14 after dose 1 (Fig. 3b).
W00000! It got *half* the virus.
Sod off.