To do that with DNA, we need to tell the DNA what to replicate, and then give it the means to do so. We do this by using enzymes and primers. Primers are a subject for another time, but they are responsible for telling the polymerase where to do its work.
Polio was nearly eradicated when society decided to mass produce and use a vaccine created by Jonas Salk. Polio was a big issue but they managed to cure it with a vaccine. Comments.
This was because polio was a viral disease can put anyone on a wheelchair. After five years when the polio vaccine was invented by Jonas Salk he decided to test this vaccine. The impact of this test was known to be dramatic. Moreover, His invention freed everyone who would continuously live in fear. The risk factor reduced greatly.