The mRNA technology was only feasible in the past few yrs. They had to find a way to effectively nano-encapsulate the mRNA.
Pfizer started to fund their partner BioNTech to develop a mRNA Flu vaccine in 2018. A vaccine technology in search of a target. Then in 2020 it found a target - Covid.
Years? Yeah, appears to be 2 yrs if advanced notice per Flu.
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