Agglutinins that act only at low temperatures; present in the blood of patients with atypical pneumonia. Using the agglutination process, a distinction may be made between Mycoplasma and virus pneumonia.
An antibody in the serum of patients with certain diseases that causes the agglutination of erythrocytes (usually from sheep) at low temperatures by the serum of these patients.
Antibodies capable of inducing agglutination, or clumping, of red blood cells when the temperature of the blood drops below the standard body temperature of 98.6°F/37°C.