Better kept than you might suspect. AIDS seems to have civil rights, I cite from Wisconsin Law. I assume it's similar in most other states:
252.15(2)(a)No health care provider, blood bank, blood center or plasma center may subject a person to a test for the presence of HIV, antigen or nonantigenic products of HIV or an antibody to HIV unless the subject of the test first provides informed consent for testing or disclosure as specified under par. (b), except that consent to testing is not required for any of the following:
Trust me, prisoner isn't one the reasons.
BUT! A few sections later in the statutes:
252.11(1)In this section, "sexually transmitted disease" means syphilis, gonorrhea, chlamydia and other diseases the department includes by rule.
(The astute reader will have noticed the absence of AIDS in the above definition)
252.11(1m)If, following a request of an officer of the department or a local health officer, a person reasonably suspected of being infected with a sexually transmitted disease refuses or neglects examination by a physician or treatment, an officer of the department or a local health officer may proceed to have the person committed...
So, you see, people with HIV can legally conceal the disease, but other folks with "ordinary" VD or sexually transmitted disease as they call it these days i.e., syphilis, gonorrhea, chlamydia etc. get tossed in the slammer if they want to conceal it. But! If you have AIDS you of course are likely to be homosexual, and well, we have to protect those people don't we. GRRRRRRRRRR
If my memory serves me, didn't Bill Clinton then governor of Arkansas sell aids tainted blood to Canadians? The blood came from prison inmates.