Talk:Kharaa Bacterium/@comment-34680126-20180328192833/@comment-36732798-20181023235204

Billions of Precursors were wiped. But there was never any sign of them before 4546B is discovered, despite humans colonizing the entire galaxy. So, the Precursors must have warped in from their (different) home galaxy.

They've crud resistance to Kharaa, no surprise if they never had to evolve along with it. While there's some natural resistance to work with on 4546B. Ryley also has some resistance. So it seem the disease is endemic to our galaxy.

Likely they earlier picked Kharaa up here while exploring, took it home -oops, then came back to find a cure in the creatures that long ago evolved a resistance. That included research on Earth, if the contents of their museum is anything to go by.