Analysis of PBMCs infected with VZV for 2 days in the presence of 200 U/ml IL-2 or left untreated revealed that IL-2 stimulation yielded significantly higher rates of infection for NK cells (1.5-fold), CD3+CD56+ lymphocytes (2.6-fold) and T cells (1.5-fold), compared to unstimulated conditions (Fig 2A). This evidence concerns the gene NCAM1 and infection.