Microbiology Which of the following is characteristic of the mucosal immune system? A A vigorous response is made to all nonself antigens encountered B Chronic inflammation makes an inhospitable environment for microbes C IL-2 and IFN-g contribute to a Th-1 like environment D Tolerance to foreign antigens is the norm rather than the exception 💡 Explanation Which of the following is characteristic of the mucosal immune system? ✓ Correct Answer: D. Tolerance to foreign antigens is the norm rather than the exception