Can the vaccine prevent virus spread to the non-immune? Understanding "Compartments" of immunity

It is very awkward for me to do this, but to lend credibility to what I have written below, I will state my background. I have a doctorate degree in immunology from The University of Notre Dame. I spent a career at the National Institutes of Health and in the pharmaceutical/biotechnology industry studying the regulation of the immune response. I have authored or co-authored over 70 scientific research publications on the same. Enough said.

In the past two years, I have spent hundreds of hours monitoring and studying scientific reports on the COVID virus, and the immunities that develop followi...