A PCR protocol was developed for quickly detecting meningococcal DNA in cerebrospinal fluid (CSF), using primers designed from the nspA gene specific to Neisseria meningitidis.
Testing on 85 N. meningitidis strains and 112 CSF samples showed that nspA-PCR didn't amplify DNA from other bacteria, ensuring specificity for N. meningitidis, with consistent results across different serogroups.
The method demonstrated high sensitivity, confirming all positive cases from traditional methods, and identifying additional positives that were missed by conventional testing, making it effective even after antibiotic treatment.