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Comparison of median levels of IFN-γ at baseline and 12 months later among patients (n = 32) and contacts (n = 74). Wilcoxon matched-pairs signed rank test was used to analyze the data. Each filled circle represents a participant and the horizontal solid lines represent medians. The median level of IFN-γ among contacts was significantly increased at 12 months compared to baseline level but among patients, there was no significant difference.
