COVID-19 Vaccine :
Pfizer and BioNTech Announce Early Positive
Data from an Ongoing Phase 1/2 study of mRNA-based Vaccine Candidate
Against SARS-CoV-2
https://www.pfizer.com/news/press-release/press-release-detail/pfizer-and-biontech-announce-early-positive-data-ongoing-0
mRNA seems to be the shortest path to vaccine.
https://en.wikipedia.org/wiki/Messenger_RNA
https://www.genome.gov/genetics-glossary/messenger-rna
https://fr.wikipedia.org/wiki/Vaccin_%C3%A0_ARN
https://www.nature.com/articles/nrd.2017.243