serum procalcitonin level and other biological markers in children with bacterial or non-bacterial meningitis

acute meningitis in children is predominantly aseptic and does not require specific treatment. however, meningitis has a bacterial origin in about 5% of patients and carries a risk of fatal outcome or severe neurological sequelae, especially when diagnosis and antibiotic administration are delayed. the objective of the present study was to evaluate the value of determining procalcitonin levels to discriminate between bacterial and non-bacterial meningitis in young children or infants and describe the variation in serum pct levels over time during the treatment of meningitis. a total of 50 children with meningitis admitted to a university hospital were followed in this prospective study. cerebrospinal fluid (csf) and serum levels of procalcitonin were measured. the diagnosis of meningitis was based on clinical findings, gram staining, culture, and chemical analysis of csf. twenty-five children were diagnosed as bacterial meningitis and the other 25 children as non-bacterial meningitis.the mean procalcitonin level on admission in patients with acute bacterial meningitis was 18.3 ng/ml, and the lower level was 4.6 ng/ml, while the higher level in patients with non-bacterial meningitis was 0.62 ng/ml (mean level, 0.38 ng/ml). it  is  clear  from  the  range  of  serum procalcitonin level that, there are no overlapping values seen  for  serum  procalcitonin  in  both  groups.serum pct levels can be used in the early diagnosis of acute bacterial meningitis and is more valuable than the other predictive marker. similarly, they may be useful adjuncts in differential diagnosis of bacterial and non-bacterial meningitis and diminishing the value of 2 nd lumbar puncture performed 48-72 hours after admission to assess treatment efficacy.