User blog comment:TheOriginalVampireKlaus/Lydia may be the reptilian shifter/@comment-5208559-20120619221341

I agree with evrything you say even though I do not want Lydia to be that reptilian thing but all the little clues point to her BUT* the only reason Jackson was immune to Derek's bite is because of Lydia. If you noticed in episode 3 Ice Pick when Jackson was talking to Matt in science class about the camera and all of a sudden Jackson starts paying attention to the video talking about how if you get an animal bite and you have this virus that is fighting off the bite and something along those lines then he looked back at Lydia and stopped her in the hallway yelling at her because whatever she is she immunes werewolf bites, and Jackson also stated it's either from blod or saliva which is implying when they dated they made out and her saliva got in with his and that is why Jackson's body is fighting off the bite!!