CD4 and coronary artery disorder: Interestingly, phenotype analysis of total and antigen-specific CD4 T cells showed that the frequencies of HDAg-specific and HBsAg-specific CXCR3+ CD4 T cells were lower than total and pp65-specific CXCR3+ CD4 T cells in patients with CHD, whereas the frequencies of CXCR3+ CD4 T cells were similar between total, pp65-, and HBsAg-specific T cells in patients with CHB.