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Antiglobulins and cryoglobulins in rabbits producing homogeneous streptococcal antibodies.

After immunization with group B or group C streptococcal vaccines, antiglobulins and cryoglobulins were found in the sera of rabbits producing homogeneous antibodies. The cryoglobulins contained antiglobulin activity and homogeneous streptococcal antibodies. The antiglobulins reacted with both rabbit and human IgG. Precipitating antibody activity to rabbit IgG lacking sialic acid was identified in one cryoglobulin. 
 
A rabbit that produced two homogeneous antibodies to group B streptococci produced a third homogeneous immunoglobulin without anti-streptococcal antibody activity after deliberate immunization with rabbit IgG. The appearance of the new homogeneous immunoglobulin coincided with re-stimulation of antiglobulin formation. The possibility is discussed that antiglobulin antibodies may be responsible for the clonal proliferation of plasma cells that leads to homogeneous immunoglobulin production.