<prompt> Cold haemagglutinin is associated with -Anti IgMAnti IgGAnti IgADonath landsteiner antibody  <response>: In cold agglutinin disease, antibody is usually IgM which reacts with red cells poorly or not at all at 37 degree celsius ,whereas it reacts slowly at lower temperature . Donath - Landsteiner antibody is involved in paroxysmal cold hemoglobinuria. Warm antibody immunohemolytic anemiaa are caused by UgH ir rarely ItS antibodies that are active at 37 degree celsius .Harrison;s principles of internal medicine 18 th edition 882. 