Q. A 22-year-old man presents to the emergency department with a 12-hour history of progressively worsening pain in the right lower quadrant of the abdomen. The pain was initially periumbilical and later localized to the right lower quadrant. He also reports a loss of appetite and a single episode of vomiting. He has no significant past medical or surgical history. On physical examination, his temperature is 37.8°C (100°F), blood pressure is 110/70 mmHg, pulse is 78 beats per minute, and he exhibits rebound tenderness at McBurney's point. Laboratory tests reveal a mild leukocytosis with a white blood cell count of 12,000 cells/?L. An abdominal ultrasound suggests an inflamed appendix with no evidence of perforation. What would be the first-line treatment for this patient's condition?