Well, its tough. A mind once corrupted in-depth is damaged beyond repair I am afraid. It loses ability to function on its own, the virus having replaced critical thought functions. Your guess is as good as mine here but putting the victim into a logical-loop is not going to solve the problem, logic and reason being the first victims in the disease’s progression. They will just “rationalize” it away somehow and move on merilly (or eerily he he) with the parasite clinging to their brain.