They just want to go undetected much like the NWO did.
I keep pointing people into the pilot episode of House, to me there is so much info in that. Stuff I already knew but still..
First you can't see them in imaging while alive, second they go near undetected as cyst in your brain until they die. At that point they stop their immune suppressors and your immune system begins to react..
But none of this is new.. as I have written at least several dozen times by now, the key to all this is immune system suppression. The Target (that's us) must be kept unaware..
Vitamin D affects the immune system at many levels and by a number of mechanisms…. Vitamin D has multiple immunosuppressant properties…. On the whole, vitamin D confers an immunosuppressive effect.
--Aronson, Amital, and Shoenfeld 2