I loved the confirmation that Saul and Tanya have both have elevated Keratin 18 levels, but I don't think we can draw any conclusions yet. I'm not sure how often Tanya has been testing herself, but her baseline for Saul is fairly old. Hopefully she'll be able to run new tests soon, and we'll see that their K18 levels have remained steady or decrease. I'd love to know if their K18 level might have been naturally high, and if that might be a factor in their potential immunity.

I suspect that Saul and Lizzie conceived the baby before Saul was (possibly) infected, so Lizzie's normal K18 level might be a bit of a red herring.