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To: neolib who wrote (188893)	3/6/2009 12:03:55 PM
From: Jill	Read Replies (1) \| Respond to of 306849

Yes she deserves a Nobel but no she ain't gonna get it. They didn't give it to her for mitochondria as organelles. Also symbiosis--it isn't exactly that the parasites are smart, pure and simple, and help us out. Symbiosis is an infection that doesn't kill you. The ability of the "host" to adapt is important as well. For instance, 1% of Caucasians are immune to HIV because they lack the receptor it uses to get into the cells--its a redundant receptor, so lacking it is no problem. And those people are direct descendants of survivors of the bubonic plague. So a genetic variation may allow you to survive an otherwise "fatal" infection and then over time your progency are fruitful and multiply and then you merge more and more, streamlining functions until you and the bug are well adapted... Moreover, sometimes the adaptation is temporary. For instance, get mono, your body kills off the Epstein-Barr virus that presents strong antigens. The EBV that survives presents weak antigens and probably reduced metabolic rate. Yet EBV is linked to a lot of cancers. So over time it may still cause problems.