In the current study, we focused on the characteristics of the immune response and investigated the characteristics of T cell subsets (CD4+, CD8+, Th1, Th2, and Th17) in patients diagnosed with different stages of brucellosis (acute, chronic, inapparent, and recovery) and in healthy individuals from a rural community in Baotou City, Inner Mongolia, China. The gene discussed is CD4; the disease is brucellosis.