60. A 19-year-old college student presents with fever, fatig…
60. A 19-year-old college student presents with fever, fatigue, sore throat, and diffuse lymphadenopathy. A physical exam reveals pharyngeal petechiae and mild splenomegaly. A rapid strep test is negative. Which of the following is the most appropriate next step for confirming the diagnosis, and what test should be performed if the initial test is negative but suspicion remains high for infectious mononucleosis?
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