An acquaint was sharing she’s had the maximum radiation treatments for cancer...plus toxic intravenous drugs for cancer and half her arms lymph nodes removed. All which destroyed good cells and bad. She will not get the vaccine under any circumstances for obvious reasons.
So you cannot put all people into the ant-vax mode you seem to think is necessary.
Her choice, but I bet 98% of doctors would tell her that in her case the risk from Covid greatly outweighs the risks of the vaccine.
But if she prefers to listen to some internet authority that reinforces her biases, fine.