Vaccines and plasma serve 2 different purposes. A vaccine will provide long term protection, but do nothing to help a patient who is sick now [0]. In contrast,

Vaccines and plasma serve 2 different purposes. A vaccine will provide long term protection, but do nothing to help a patient who is sick now [0]. In contrast, plasma will help a patient who is infected now, but provide no long term protection. [0] Or, at least, the Covid vaccine has not been proven to do anything to help a patient who is sick now. There are cases (such as rabies) where getting vaccinated after being infected is still beneficial.