What happens when a new disease occurs, is that it can be very devastating, as happened to the North American Indians when the explorers unintentionally gave them measles, they had no resistance. Millions died. Likewise with AIDS in Africa.
Resistance builds over generations just like we have built resistance to the bubonic plague, without ever having a vaccination. Generating this resistance requires an intelligence that is normally built up over the centuries by the genetic/epigenetic intelligent mutation/adaption process. The same way as giraffes get long necks.
What PC technology maybe facilitates, although it is too soon to say this sure, is immediate access to this intelligence so that we don't have to wait centuries for our immune systems to catch up. We can do it immediately, and this is incredibly revolutionary. As well as very effective. So it's not a medical treatment as such at all, it's the necessary specific intelligence required for the immune system to deal with the disease intelligently. It seems to be a fast forward a few centuries. Problem is I can't figure out how to test this.