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A 29-year-old has had fever and fatigue for 3 weeks, with no sore throat and a mildly raised ALT. WBC is 11.2 × 10^3/µL (11.2 × 10^9/L) with 62% lymphocytes, many of them reactive. Two heterophile tests, EBV viral capsid antigen IgM and IgG, and an HIV antigen/antibody test are all negative. The most likely cause is:
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