Spoiler break.....

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So according to Doctor Coady, Castor and Leda both have the same disorder, it just expresses differently: in women it causes infertility, in men, a disease which looked like Crotzfeld-Jacob disease when Cosima and Scott looked at Seth’s brain.

Delphine’s description of an abnormally folded protein, that is infectious makes this sound like a prion disease.

So it occurs to me: If it messes with the brains of the Castor clones, but still ends up in their semen, what’s to stop it from being in the vaginal secretions of the Leda clones? Could Alison have infected Donnie and Jason? Is the whole point of bringing Jason into the picture for us to see Jason start glitching like Seth so so we find out Donnie is also infected?

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