Board Thread:Oblivion/@comment-35782287-20181210034050/@comment-25350022-20181210034619

There's only one type of nightshade that can be harvested. No difference between nightshade or nightshade leaves.

After completing the quest you can contract Porphyric Hemophilia from a vampire again, but it will never progress to full vampirism. It'll just leave you with a fatigue penalty until cured, like any other disease.