NAVLE® Question of the day

A four-month-old filly is presented with a four-day history of lethargy, heavy breathing, cough and decreased appetite.

On lung auscultation asymmetrically-distributed crackles and wheezes are audible. Some areas have no breath sounds and a dull resonance on thoracic percussion. A lateral chest radiograph shows consolidated nodular lung lesions and mediastinal lymphadenopathy.

Pneumonia due to Rhodococcus equi  infection is confirmed based on culture and polymerase chain reaction results on a transtracheal wash. 

Which one of following choices is the most appropriate treatment?

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