Operation Warp Speed gave equally huge sums of money for each of: mRNA vaccines, adenovirus vector vaccines, and the more traditional protein adjuvant vaccines:

Operation Warp Speed gave equally huge sums of money for each of: mRNA vaccines, adenovirus vector vaccines, and the more traditional protein adjuvant vaccines: https://en.wikipedia.org/wiki/Operation_Warp_Speed#Companies_receiving_research_funding https://en.wikipedia.org/wiki/Operation_Warp_Speed#Companies... Adenovirus vector vaccines are also very new technology: First one was approved only in 2019, an ebola vaccine.