I am not a biology student and this question came in my mind out of nowhere.

I read somewhere that the vaccines contain some denatured or almost dead corona viruses and when these are injected in our body , our immune system remembers them and if the actual (killer) corona virus enters our body , our body recognises it and quickly attacks it.

But if we have a corona patient his body has already identified the corona virus and so if the vaccine is given the body will not have much changes to do and simply refuses it .

So is it okay to give the covid vaccines to a covid patient ?