What are the two drugs that have immune mediating properties of Idiopathic antibiotic-responsive diarrhea?

• A. Tylosin and Metronidazole
• B. Rifaximin and Neomycin
• C. Ciprofloxacin and Metronidazole
• D. Amoxicillin and Metronidazole

Answer: (A)

The concept being tested is that some antibiotics have immune-modulating effects in the gut beyond their ability to kill bacteria, and these properties can be important in idiopathic antibiotic-responsive diarrhea. Tylosin, a macrolide, is known for anti-inflammatory effects in the intestinal mucosa; it can dampen mucosal inflammation and modulate immune responses in the gut. Metronidazole also has immunomodulatory actions, reducing inflammatory mediators and neutrophil activity, which helps address the immune component of intestinal inflammation seen in this condition.

Together, these two drugs target both potential bacterial factors and mucosal immune activation, making them a logical pair for immune-mediated aspects of antibiotic-responsive diarrhea. Other options pair antibiotics that are mainly used for their antimicrobial effects without the same well-established gut immune-modulating properties, so they don’t fit the concept as clearly.