[@FalloutJack] As for the X parasites, I know about them, they're also able to replicate whatever they... what is the word... assimilate? But they're not initially that smart, but are effectively like [i]"The Thing"[/i] and [i]"The Blob"[/i].

Even if someone had or didn't have energy to heal; I don't feasibly see how that would have purged a parasite logically speaking from a forensic standpoint.  So I did account for that; the healing would be more for... lacerations, burns, possibly treating different kinds of infections, or even just blocking or purging radiation if it is present.  

(Though, I do think Radiation purging would be a bit much, see as I would not feasibly understand how it would work... But Metroid is Space Fantasy, not Sci-fi. Tech used to convey magic,exct.)

But I'll see what I can scrounge up later. 

I'll send you a more thought out idea when I am more awake. But so far, my mind is brimming with ideas I can find both amusing, fun, and practical all at the same time. So I say off to a good start.