If it is established that you've contracted the ebola virus, is it prudent to let you travel about the country? You say you own your body; how could anyone stop the spread of this virus unless in certain cases, you don't own your body? Hmm?
You mean quarantine laws are constitutional? The sky is falling!!!
Of course not. In that case I would be committing assault on anyone I came in proximity to. That doesn't negate my ownership of my body any more than laws prohibiting me from punching somebody in the face. It's also entirely irrelevant to the question of organ sales, which do not involve harm to nonconsenting individuals.