A 5-year-old African American boy presents to his doctor with nausea and vomiting, hoarseness, and loud rapid breathing. Physical exam reveals a swollen neck, a gray inflammatory membrane in the tonsillar area, and stridor. At 24 hours, his cultures grew anaerobic, Gram-positive bacilli. What is the pathogen?
A. Bordetella pertussis
B. Listeria monocytogenes
C. Corynebacterium diphtheriae
D. Nocardia
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