The COVID-19 vaccine may in fact be the most fast-tracked vaccine ever created in all history. However, this rush to be first to the market necessitated the elimination of required safety testing steps, such as animal testing.
Pfizer, in collaboration with BioNTech, began human trials in the U.S. of a COVID-19 vaccine on May 11, 2020. If it seems to be successful, the vaccine could be released as early as September 2020 with an FDA-approved Emergency Use Authorization or (EUA).
Like Moderna and several other competitors, the Pfizer/BioNTech vaccine is using messenger RNA or (mRNA) rather than live or attenuated, inactivated viruses grown in animal cells.