The mean fold increase of US RNA (expression at day 4 compared to day 0) following infection of PHA/IL-2 activated, CCL19-treated and unactivated CD4+ T-cells was 21.1, 1.1 and 0.5 fold respectively (n = 5; p < 0.05 for all comparisons; Figure 3B). The gene discussed is CD4; the disease is infection.