Well-reasoned input is always helpful and it IS a complicated question to consider. The power of Plague Carrier also has a bit of an error with the idea it could be negated with a powerful spread of anti-biotics, since they're worthless against viruses and at best would just wipe out the bacteria the hero or villain is holding, not the viruses or rare amoeboid infection. The basic power will let you infect someone with a specialized strain of a disease that won't spread but yes there are still very serious implications in giving someone a terminal disease even if they can't spread it to others when you're the only cure around.
Some other powers also have the potential to cure a terminal illness, several of the Biophysical Control powers might cure cancer or AIDS in a target, but for Damage Transferral are you somehow converting the terminal illness to a curable form or is it just that the enhanced healing Damage Transferral provides in regards to absorbed damage makes the body able to fight what was a terminal illness in someone else?
Power Creation might even let you cure others if you have the proper powers to give to someone, like Regeneration or Resistance to Disease (one of the concepts I'd considered for the hero Power Up I created and posted here in fact), although how much such powers might help likely depends on the power ranks you can grant.
Still, if a PC wanted to cure such things in a campaign and the GM wanted to allow for the possibility what would the Reason feat be then, Amazing, Monstrous? What talents would a character require, is a talent in cancer research a requirement or would relate talents like Genetics be all it's take?
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