Virulent viruses don't work like that. Once they destabilize one subsystem, the system as a whole takes hit. By the time they switch to which ever other subsyst

Virulent viruses don't work like that. Once they destabilize one subsystem, the system as a whole takes hit. By the time they switch to which ever other subsystem they want the body is more or less shutting down. That's why highly optimized virus don't last long.