Your doctor doesn’t know what he/she is talking about. Period. What they did to develop this potential vaccine is snip the protein spikes of the coronavirus. If you’ve seen portrayals of the virus the protein spikes are the protrusions surrounding the virus core.
They then introduced those into the test subjects in varying amounts to determine if the human body would recognize them and develop antibodies against them.
In the initial testing this worked. Antibodies were detected.
However, it was later reported that the subjects that received the highest levels of the spikes into their bodies many days later developed some very unpleasant and serious issues called Level 3 issues.
No word yet what those subjects problems were as of yet.