This study aimed to isolate and phenotype lymphocytes in untreated children patients with chronic allergic asthma. To reach such aim the study involved (25) patients from children (17 male and 9 female) whom their ages where between (3-10) years, in addition to (15) apparently healthy children (9 male and 6 female) in the same ages involved as control group. The data demonstrated that there was a significant increase in the mean percentages of T-lymphocytes (CD3+ cells) in the peripheral blood of patients (66.75±0.29)**, in comparison with control group (43.58±0.19), a significant increase in the mean percentages of T-helper lymphocytes (CD4+ cells) in the peripheral blood of patients (51.14±0.55), in comparison with control group (39.17±0.23) and the mean percentages of B-lymphocytes (CD20+ cells) was also increased significantly in the peripheral blood of patients (29.63±0.20) when it compared with the mean percentages of the same cells in control group (18.60±0.80). Besides a significant decrease in the mean percentages of T-suppressor lymphocytes (CD8+ cells) in the peripheral blood of patients (11.31±0.05), in comparison with control group (16.42±0.15). Finally the results of this study showed a significant increase in the mean percentages of the ratio of (CD4+ cells/CD8+ cells) in the peripheral blood of patients (55.34±0.41), in comparison with control group (31.25±0.09).
