Day 180 and 365 analyses (Figure 7A) however, showed that patients with CMV infection had significantly higher absolute concentrations of Vδ1 cells, significantly higher percentages of Vδd1/TCR γδ cells and significantly lower percentages of Vδ2/TCR γδ cells compared to patients who had not had CMV infection. The gene discussed is CYP27B1; the disease is cytomegalovirus infection.