So I've done a bit of research and found out that you can lawfully be held in a hospital under federal quarantine if you have certain diseases for public protection, such as yellow fever or Ebola . I've read about Robert Daniels and Andrew Speaker as a bit of background research. I also found information about escaped TB patients but nobody would confirm whether anyone had been sent to track them down. In my story the B character is hospitalized for an unknown disease (an undiscovered fictional disease) which the A character has unknowingly passed on to her. A realizes what is going on after something happens and knows that he needs to get her out of there to protect them both. If someone were discovered to have a previously unknown disease would they automatically have to be put in federal quarantine? What if someone in quarantine escaped, I'm assuming the hospital security would pursue them but is it likely that they would they be tracked by the law?