Once you have a drug/vaccine candidate, you must try it in vitro, then in mice, then in a small number of human, then in a medium number of humans and then in a large number of humans (with a double blind randomized control group). If after all these tests it is better than the current state of the art, then you can give it to a random human when they are ill.
(And I'm skipping a few steps. Preparing the drug in a lab is hard, and preparing it in an industrial facility is also hard for different reasons.)
So, from a brilliant AI of HI idea to a prescription it takes like 10 years (assuming the idea is good and you didn't kill a few mice for no good reason).
