Investigation of the relationshipbetween the PCT SL and prognosis in children with bacterialmeningitis  82 patients included  Patients withbacterial meningitis have higher PCT SL than those with viralmeningitis  PCT SL were significantly higher in patientswith severe sepsis and septic shock than in patients withnon-severe sepsis and without sepsis  A drop in PCT SLwas observed in patients with a good response to antibiotictreatment  PCT SL were significantly higher in patientswho died than in survivors. Here, CALCA is linked to infectious meningitis.