PLE-3583

A 1/M infant consults for paroxysms of violent coughing. You note cyanosis around his lips during coughing. Parents note that the patient had symptoms of the common colds for a few weeks prior. Patient has not had any immunizations since birth. To identify the etiologic organism, you take a nasopharyngeal aspirate. On which culture medium would the most likely etiologic agent grow?