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A 20-year-old man with no significant medical history presents to his primary care office for evaluation of a fever, sore throat, and fatigue for the past 2 weeks. He has been taking ibuprofen as needed for fever control. The patient reports that he is in a monogamous relationship and is sexually active. His vital signs are a HR of 77 bpm, RR of 17/min, oxygen saturation on room air of 99%, BP of 122/84 mm Hg, T of 101.8°F, and BMI of 23.6 kg/m2. On physical exam, he has enlarged, mobile, and tender lymph nodes along the posterior cervical chain bilaterally. The posterior oropharynx is erythematous with tonsillar exudate. Which of the following laboratory tests will be most useful in diagnosing this patient?AComplete blood count with peripheral smearBCytomegalovirus antibody assayCHeterophile antibody testDRapid streptococcal antigen assayEThroat culture
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