cold agglutination phenomenon

cold agglutination phenomenon

[′kōld ə‚glüt·ən′ā·shən fə′näm·ə‚nän]
(immunology)
Clumping of human blood group O erythrocytes at 0-4°C, but not at body temperature; occurs in primary atypical pneumonia, trypanosomiasis, and other unidentifiable states.