Cold agglutinins are predominately immunoglobulin M autoantibodies that react at cold temperatures with surface antigens on the red blood cell. This can lead to hemagglutination at low temperatures, followed by complement fixation and subsequent hemolysis on rewarming. Development of hemagglutination or hemolysis in patients with cold agglutinins is a risk of cardiac surgery under hypothermia. ...

Mycoplasma pneumonia is an atypical pneumonia commonly affecting young patients with generally mild clinical course. We present a case of a 66-year-old female presenting with weight loss, night sweats and low-grade pyrexia. She acquired symptomatic haemolytic anaemia requiring blood transfusion, markedly raised erythrocyte sedimentation rate (ESR) to 114 mm/hr and extensive peri-hilar lymphaden...

A “cold” platelet agglutinin is described reacts only at temperatures below 34#{176}C. which is present in plasma and serum, It agglutinates homologous and autois greater than 100,000 in molecular logous platelets but appears to have no weight, appears to be a protein of the imeffect on in vivo platelet function. It is munoglobulin type, is adsorbed by plateseen in patients with systemic diseas...