pfizer vaccine jab into ur arm.. pandemic over? u no longer get infected n wont transmit to others? % of human error in cold chain?? % people willing in inject? efficiency of population get injected? nation to nation conflict will slow down vaccine roll out and conspiracy theory would hinder the vaccine plan to end pandemic.. mixed vaccine used. pfizer effective, sino not effective, how? sino stop varient a-g, pfizer stop h-z how?