patient 1 , a 4-year-old girl with suspected food allergy , failure to thrive , and chronic diarrhea , exhibited a decreased serum igg immunoglobulin level , decreased numbers of peripheral blood t lymphocytes ( erythrocyte rosettes ) , decreased numbers of t-lymphocyte subpopulations ( t3+ , t4+ ) , decreased responses of lymphocytes to common mitogens , and absent in vivo responses to delayed hypersensitivity skin test antigens .
C0229664
peripheral blood
C0014792
erythrocyte