Re-watching Lighthouse here they talk about Dogen saying Sayid was infected just like Claire, but the two show totally different symptoms. It feels like they're two separate things- whereas Claire just kind of went crazy and wants Aaron back and is letting herself be manipulated by MIB, Sayid has something seriously wrong with him. He has completely changed and basically died emotionally, but Claire swings all around (as seen by her apology to Kate after trying to kill her). Anything to the thought that the two have different things going on, or can the sickness just manifest itself in a variety of ways?

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