On a physical exam, a thick gray coating is seen in the posterior pharynx in a patient with low-grade fever, malaise, and sore throat. Which organism is responsible for the suspected diagnosis?Corynebacterium diphtheriaeCoxsackievirusEpstein-Barr virusNeisseria gonorrhoeaeA 3-year-old African immigrant girl is brought into the emergency department with congestion and a sore throat. She has never received her vaccinations. On examination, she is noted to have a low-grade fever; tympanic membranes are pearly gray without injection or visible air-fluid levels. The throat is erythematous with enlarged tonsils covered by a grayish membrane. Tonsillar nodes are tender. Lungs are clear to auscultation. Rapid strep screen is negative. Which of the following is the most likely etiologic agent of her illness?Bordetella pertussisCorynebacterium diphtheriaeHaemophilus influenzaeStreptococcus pyogenes

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