Delta strain reproduces at ~1,200x faster rate than the already contagious original COVID19 strain. This is an absolutely massive difference and works on quasi-exponential scale! The body cannot detect and react immediately in force to a virii intrusion, hence a vaccinated person can be infectious, but with everything else being equal, he or she will have lower viral load (hence level of infectiousness) and shorter period of infectiousness compared to an unvaccinated person.
Why is that not clear to most people opposing vaccination on these grounds, is beyond me.
Why is that not clear to most people opposing vaccination on these grounds, is beyond me.