When Sylar was poking around in Claires brain, he said something like "your unique claire, you will never die" like her brain was wired differently. So while a few people have absorbed her healing ability, Sylar did imply that immortality may be exclusive to her. It may have to do with her developing her abilities during puberty, making her physiology unique and something that couldn't be passed on to others when they absorbed her abilities...or something like that.
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