Healthy donors and sample information.^a

aCharacteristics for the healthy donors (HDs) used in this study (n = 10). bFor each patient, one sampling was performed in healthy gingival sulcus of the right mandibular molar. Normal Clinical attachment level and gingival index values are considered to be less than 3 mm and 1, respectively. cFrequency (%) of EBV-infected periodontal epithelial cells (pECs). dRNA samples used for EBNA1 and CCL20 gene expression analysis. eOverall mean values and standard deviations (SD).