EBV-specific CD8+ T-cell IFN-γ Response by Residence and Age Groupa.

n, number; %, percentage; EBV, Epstein-Barr Virus; PHA, Phytohemagglutinin.aData in the table are weighted according to the 149 children who participated in all surveys and had interpretable Epstein-Barr Virus (EBV) specific CD8+ T-cell IFN-γ response.bPhytohemagglutinin (PHA) was used as a positive control.cMedian EBV-specific CD8+ T-cell IFN-γ responses were calculated among children with positive responses and is expressed as spot forming units (SFU) per 1×106 peripheral blood mononuclear cells (PBMC).