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Flow cytometry analysis of OKT4 epitope deficiency in South African black children

A case of OKT4 epitope deficiency referred for investigation with suspected immunodeficiency is described. Flow cytometry analysis of OKT4 epitope deficiency in a study group of healthy black children showed different manifestations of the lack of OKT4 epitope; a complete lack of OKT4+CD4+ peripheral blood lymphocytes (PBL) with normal numbers of OKT4A+ and Leu‐3a+CD4+ PBL, decreased percentage OKT4+CD4+ compared with OKT4A+ and Leu‐3a+CD4+ PBL, decreased fluorescent staining intensity with OKT4 and a biphasic OKT4 staining pattern associated with a reduced OKT4/Leu‐3a ratio. The percentage and fluorescent intensity of OKT4+CD4+ PBL in the study group were significantly lower (P < 00001) than Leu‐3ab+CD4+ and OKT4A+CD4+ PBL. There is thus considerable risk of under‐estimating the number of CD4+ cells in black South Africans if the OKT4 MoAb is used.