I have a background in product design and so am familiar with with how most things are mass-produced — food, machines, etc. But I've been able to find very little information on how vaccines are mass-produced.
It looks like there are 4 types of vaccines, all of which include pieces or byproducts of the virus they're intended to counteract.
If you're producing billions of vaccines, I imagine you need a tremendous amount of the virus.
How is such a mass of virus obtained? Do they just fill up tanks with a culturing agent and a sample of the virus and wait for it to grow, like a giant petri dish? Are there big vats of Coronavirus sitting in factories somewhere?