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False negative β‐2 transferrin in the diagnosis of cerebrospinal fluid leak in the presence of Streptococcus pneumoniae

The objectives of this study were to examine the presence of β‐2 transferrin (β2TRNSF) in cerebrospinal fluid (CSF) contaminated in vitro by various bacteria and explore the mechanism (passive or active) responsible for β2TRNSF elimination. Early diagnosis of CSF leakage may change treatment decisions and minimize the risk of meningitis and encephalitis. β2TRNSF is a protein present exclusively in CSF. Its detection is highly useful in cases of CSF leakage, although it has never been examined in the presence of central nervous system infection.