[That's the answer Gai had been expecting, so he's not surprised at all.]

Think of it as being like a form of cancer activated by genomic resonance. Those who are infected with it will eventually develop crystalline growths on their skin that spread over their entire body. If you don't receive the vaccine at an early enough stage, it becomes terminal-- in other words, a prolonged death sentence.

[He's completely calm as he says this. He's not looking for any sort of pity-- he accepted this fate long ago. He's already come to terms with it and what it will eventually mean for him.]