I agree that the new drug candidates had promising results. Yet as a new technology, there was still a risk. For example, the first Pfizer drug candidate BNT16

I agree that the new drug candidates had promising results. Yet as a new technology, there was still a risk. For example, the first Pfizer drug candidate BNT162b1 gave fever to 75% of the participants in some cases [0]. Some countries decided not to buy from them at first for that reason. [0] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7583697/figure/f3 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7583697/figure/...