Well SC, you forgot to mention about how virus' mutate and cross over between animals and humans. As I remember the current train of thought is that HIV was a mutation of a virus that infected apes.
Watch the news reports and you would find out about the "Bird Flu" which is an example of a crossover in 2 unrelated animals.
Im not wordy like SC. Get out your college biology book and go to work. Web MD might be of some help too.
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40 something, 6' 175 brn/brn hairy looking for other married wm or younger guys to play.
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