Furthermore, percentages of IFN-γ producing CD4+ CD3+ cells were similar in cavitary and non-cavitary PTB after any stimulus, percentages of IL-17 producing CD4+ T cells were also similar among cavitary PTB, non-cavitary PTB and healthy controls(p>0.05) except that of cavity TB under PHA stimulation was higher than that of healthy donors, p was 0.049. This evidence concerns the gene CD4 and tuberculosis.