IFNG and infection: We found the highest median IFNγ-production 1 month after infection (15,806 pg/mL), which significantly decreased at the subsequent study visits (5,144 pg/mL (p = 0.0004); 1,885 pg/mL (p < 0.0001) and 5,214 pg/mL (p < 0.0001) at month 10, 13 and 20, respectively).