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The impact of meningococcal polymerase chain reaction testing on laboratory confirmation of invasive meningococcal disease.Laboratory methods of diagnosis were examined for 266 children with invasive meningococcal disease. Seventy-five (36%) of 207 cases with bloodstream infection had both positive blood culture and blood meningococcal polymerase chain reaction (PCR), 130 (63%) negative blood culture and positive blood PCR, and 2 (1%) had positive blood culture and negative blood PCR. Sixty-three percent of cases were diagnosed by PCR alone.