IL33 and infection: In recent years, IL-33 has been found to be involved in various disorders of the central nervous system (CNS), including multiple sclerosis (MS) (5, 6), infection (7, 8), ischemic stroke (9, 10), traumatic brain injury (TBI) (11, 12), spinal cord injury (SCI) (4, 13), brain tumorigenesis (14, 15), and mental disorders (16) (Figure 2).