Infectious Diseases & Immunology
A 14-year-old boy is seen in the emergency room because of a 3-week
history of fever between 38.3°C and 38.9°C (101°F and 102°F), lethargy,
and a 6-lb weight loss. Physical examination reveals marked cervical and
inguinal adenopathy, enlarged tonsils with exudate, small hemorrhages on
the soft palate, a WBC differential that has 50% lymphocytes (10% atypical), and a palpable spleen 2 cm below the left costal margin. Which of the
following conditions is the likely diagnosis?
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