Would cultivating and injecting a huge amount of your own white blood cells be good or bad for you while sick?

As in a large injector's worth or perhaps an IV drip of your own white blood cells. If you want to you get into the nitty gritty of the science of how to cultivate and keep alive until administration a volume of WBC for a particular patient but the core purpose of the question is asking if doing such a thing will risk killing you or make you healthier.