Gene expression in Quantiferon
household contacts. Box plots are shown with the horizontal lines indicating median levels of Quantiferon+ (white bars) and Quantiferon- (grey bars) household contacts. The lower and upper edge of each box indicates the 25th and 75th percentiles, respectively. Data were analysed using nonparametric Mann–Whitney test with p-values indicating significant differences after transformation of data to Log2 values. *P < 0.05.