It should be zero. We were told the shots would prevent covid.
Originally, they estimated the vaccines to be around 90% to 95% effective against symptomatic Covid. Then they lowered it to around 88% to 93% efficacy against hospitalization after Delta took off. Now with Omicron ... they expect it to be even less effective at preventing you catching it.
Almost NO vaccine has 100% efficacy. Example:
One dose of MMR vaccine is 93% effective against measles, 78% effective against mumps, and 97% effective against rubella.
Two doses of MMR vaccine are 97% effective against measles and 88% effective against mumps.
Source: https://www.cdc.gov/vaccines/vpd/mmr/public/index.html
The rabies vaccine is something of an exception, with 100% efficacy. Thank Heaven.
BTW, I am not a rabid pro-vaxxer, and am firmly against mandates. I am not rabidly anti-vaxx, either: I don’t believe they contain itty bitty razor blades and squiggly parasites and make you magnetic, as some on FR believe. I believe it is, and should be a private personal decision and each person’s decision should be respected, either way.