I think that you will find that in the case of someone carrying an infectious illness, the Bill of Rights does not even come into the arguement. In fact, you will find that any country has laws that permit them to take any measures nesessary with regards to containment of that infection vector. That includes deadly force and insitu cremation of the remains. And yes, that means exactly what you think it means.
No reasonable person want's to infect others but this gentleman has to be contained.

Also, don't confuse this with early 20th Cent misuse of mental health powers.