Ralph, Ralph, Ralph, all that means is that when they developed an inactive vaccine and injected into lab animals carrying the live virus it has a virulent effect. It doesn't mean that someone once vaccinated against the Sars virus, or someone sick with the Sars virus or any other virus prompted it, it meant that they couldn't use the same typical vaccine method of using a killed virus to develop a vaccine to kill the live virus inside the mice without it affecting the lungs. They found the exact same problem when trying to develop a vaccine for Sars, Sars killed virus reacted virulently with the live virus. That's why Ralph there's been no vaccine for Sars or Mers found to this very day. They haven't figured out how to accomplish it yet.

Now they've changed the name from COVID 19 to Sars COV 2 as they think now that the SARS virus has mutated into this new SARS COV 2.