There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
Neither pure Sapiens or Neanderthals carried those aforementioned diseases, but it was created as a side effect of interbreeding for their modern hybrid offspring. Because with the re-combination of the genomes, everything can happen, either positive or negative.
BTW, here is a good document about the interaction between the modern human species and other archaic human species.