stage 1 the infected person will feel bad pain they are still sane at this stage and in wich there volcal cords begin to damage wich causes the person to growl and grunt they are still conscious stage 2 the infected persons body begins to twist into sickning and horrible forms Wich cause Great pain to the infected person as there body keeps changing each form is different and unique the person and barley even talk without grunting and growling they are still conscious stage 3 they an no longer talk and there body had turned numb there body keeps changing constantly but they are no longer in pain they can no longer remember who they were at this stage they can be cured temporarily with cold temperatures they are still conscious at this stage but fully gone insane stage 4 all I can tell you is to run as there transformation has stopped they are no longer in control and they are non cureable at this stage they are no longer cousious and they have highted aggression at this stage wich in turn causes them to eat whatever they can find because of the loss of wheight during there constant change of form in pervois stages