There is currently limited manufacturing capacity for new vaccines, with most players being small startups.

“vaccines take manufacturing capacity right now there is no big manufacturing capacity sitting out there empty waiting for some unknown virus to attack us and then cause for a need for a major vaccine program and so right now the only players there's one single one player in this entire effort that even has the capacity to manufacture these this in any meaningful way all the other ones are smaller startup companies that are bringing some good science to the table but they all are likely acquisition type issues where if they got the product they get bought by a big company and move on”