Ebola is a viral infection, so in theory, he should be immune or at least, strongly resistant to reinfection. According to wikipedia, there are four variant viruses that are thought to be disease causing in humans. I suspect that he would be much less resistant to the other three.
Right. But since the current outbreak is limited to a single strain, he should have an acquired immunity. However, he's probably more useful contributing as a research subject state-side, than a treatment specialist in West Africa, to say nothing of the physical and psychological health issues he's most likely still facing.
