10 free NAVLE practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
NAVLE Practice Test 12Tutor mode
Question 1 of 10
Clinical Practice
In a feedlot, 12 of 200 recently weaned, mixed-source beef steers weighing about 550 lb developed fever, depression, and nasal discharge 10 days after arrival, and 3 have died despite treatment. A febrile steer has a temperature of 106.0°F (41.1°C), heart rate 96 beats/min, and respiratory rate 64 breaths/min, with harsh cranioventral lung sounds and a soft cough. Necropsy of one steer shows cranioventral consolidation of about 40% of the lung, thick fibrin on the pleura, distended interlobular septa, and well-demarcated areas of coagulation necrosis that give the lung a marbled look. Which of the following is the most likely primary bacterial pathogen?