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a, b. Seroprevalence of EBV infection. Proportion of seronegative patients older than 19 during the studied period in the hospital database (a) and the city laboratory database (b). (c) proportion of seronegative patients in 3 periods (2001–2005, 2005–2010, 2011–2015) for 6 age classes (<10, 10–14, 15–19, 20–29, 30–39, 40–49, and ≥50 years) in the hospital database.
