"Indeed. Iratus share a hivemind, and it is the vestigial remnants of that that give Wraith the ability to talk mind to mind. Speaking aloud, as I am to you, is not the natural way for us. Not to mention that it is severely lacking." Though it was easier to hide and lie, when conversing with one's voice instead of mind.

"When the young female bit you, she passed on the retrovirus that was changing her, to you. And though doctor Beckett managed to reverse the changes it wrought on you, his treatment obviously didn't revert all." The traces left in Sheppard's DNA made that perfectly clear. "So, what remains is apparently enough to allow for some manner of link between you and most likely other Wraith, if it is actively sought."