I agree with this.
We owe the other prisoners, not infected with a deadly disease, a reasonable assurance that they will not contract a deadly disease while wards of the state.
Again, we need to go back to the rules governing health care as it is provided in prisons. Generally speaking you cannot isolate/segregate an inmate just because s/he has disease X - unless disease X will spread by merely being in the presence of the inmate. That's why active TB cases are segregated in the infirmary until they either submit to treatment and become non-communicable or die. And yes, inmates have the right to refuse medical treatment. Sure, you can try for a court order to force it on them, but outside of MH issues it becomes more difficult.
Prisoners who are X-positive and who behave in a manner that subjects staff/other inmates to the possibility of having X spread to them - fighting, spitting, throwing bodily fluids, biting, etc. - can be segregated because of their behavior -- but mot merely because they are X-positive.
And even if their behavior is such that they pose a transmission risk, the administration cannot hang a big red "I HAVE X" sign around their neck or on the front of their cell. Go read and thank HIPAA for that. Best you can get is a policy that anybody that fights, spits, throws bodily fluids, bites, etc. and the person on the receiving end can/must be tested for a specified list of communicable diseases. Even if Inmate X does it three times a day, and has been tested daily for the last year, he gets a new test every time because doing otherwise would disclose his personal medical information.
Go look at how your free-world healthcare system deals with bodily-fluids exposures. Actually read the form you sign almost every time you access health care.
stay safe.