Unfortunately none of the vaccines are or ever have tested safe for use in humans.
I was a nurse in an ER as well. After I left that job I had time to do some research. All vaccines are hazardous to humans, and pets too for that matter.
No virus has ever been isolated, except on a computer. What we were told is Flu is just a purging our bodies do to maitain homeostasis.
Natural immunity is the only way to achieve immunity.