A, Prevalence of Epstein-Barr virus (EBV) DNA in breast milk at postpartum weeks 6 (n = 79), 10 (n = 79), 14 (n = 76), and 18 (n = 59). The prevalence of EBV DNA was significantly higher at 6 weeks and decreased through 18 weeks (P < .0001). B, EBV loads in breast milk at approximately postpartum weeks 6, 10, 14, and 18. The mean ± SE EBV load of detectable (nonzero) samples was 3.62 ± 0.127 log copies/mL at 6 weeks, 2.81 ± 0.091 log copies/mL at 10 weeks, 2.70 ± 0.099 log copies/mL at 14 weeks, and 2.56 ± 0.089 log copies/mL at 18 weeks.