decreased si were associated with numerous infectious and lymphoreticular diseases and were caused by any of the following : ( 1 ) the presence of serum immunosuppressive factor ( s ) in the patient serum , ( 2 ) the decreased response of lymphocytes to mitogens , or ( 3 ) increased mitogenicity of lymphocytes due to unidentified serum factors in absence of phytomitogens .
C0009450
infectious
C0012634
diseases