that higher levels of anti-body are associated with higher levels after vaccine efficacy. this is referred to as an immune correlate. this is a paper recently published. it shows a model of vaccine efficacy based on the phase three trial showed that four weeks after the second dose that what you have is a neutralization of one to 100 that goes up from the vertical red line. that gives you an efficacy of 91%. if you look at the dark black line going from left to right, as you go further up you get a higher degree of efficacy. so the higher the neutralization, the higher degree of efficacy of the vaccine in this model.
Levels
Paper
Vaccine-efficacy
Anti-body
Immune
Dose
Model
Phase-three-trial
Four
Three
Neutralization
Line