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Journal Article
Systematic Review
Bacterial Meningitis in the Absence of Pleocytosis in Children: A Systematic Review.
Pediatric Infectious Disease Journal 2021 June 2
One of the main features of bacterial meningitis is pleocytosis. However, when children with meningitis present within hours of onset of symptoms, there is the possibility that the meninges are not yet sufficiently inflamed to lead to a raised cerebrospinal fluid (CSF) white blood cell count. A systematic search was done to identify published studies reporting children with culture- or polymerase chain reaction-proven bacterial meningitis in the absence of pleocytosis. We identified 26 studies describing 62 children (18 neonates). In those in whom fever duration was specified, 32 (80%) of 40 had a fever for less than or equal to 24 hours before lumbar puncture (LP). In those in whom the glucose level was reported, it was normal in 14 (82%) of 17 neonates and 33 (80%) of 41 older infants and children. The protein level was normal in 8 (44%) of 17 neonates and 32 (80%) of 40 older infants and children. Twelve of the 62 children had a Gram stain of their CSF and this was positive in 2 (17%). Simultaneous blood cultures were positive in 5 (28%) of 18 neonates and 21 (68%) of 31 older infants and children. There was no association between the absence of pleocytosis and particular bacteria. All of the 10 children who had a second LP had an abnormal CSF including pleocytosis. These findings indicate that the absence of pleocytosis does not exclude bacterial meningitis reliably and should be interpreted in the context of the duration of illness. CSF samples, particularly those from cases with relatively short symptom duration, should be cultured even when the cell count and biochemistry are normal. A second LP can be helpful when bacterial meningitis is suspected despite a normal initial CSF.
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