In univariate analyses comparing either cytokine concentrations in supernatants or the frequencies of IFN-γ-producing T-cells, for both stimulus (PHA/DBL-5) and at either time-point, there were no discernible differences or marked trends that distinguished the groups with sub-microscopic infections from those either with microscopic or with no infections (data not shown). The gene discussed is IFNG; the disease is infection.