 The doctor visited a patient who had just suddenly come down with a virulent form.His symptoms had begun 18 months before, starting with a strange immobility and a loss of initiative and spontaneity; he found he had to make a huge effort to walk, to stand, and to make the least movement—his body was disobedient.The immobility attacked with frightening speed, and within a year, he was unable to stand alone and could not control his posture (2006).