Summary of 626 Nm isolates used to test the sensitivity of the sodC assay.

1Serogroup-specific PCR testing was performed to detect serogroups A, B, C, W135, X, and Y; isolates not positive for one of these serogroups were termed NG by PCR. Serogroup-specific PCR was not performed on carriage study isolates that were ctrA-negative.2All ctrA Ct values were generated at CDC except the MD carriage isolates, which were tested at the MD Department of Health and Mental Hygiene.3All sodC results were an average of 2 Ct values except M17304, which is an average of 4 Cts.424 ctrA-negative, sodC-positive NG Nm from this carriage study yielded No Ct for ctrA. However, one such isolate, M05046, gave a negative ctrA Ct value of 36.0.5MLEE results for the isolates collected in the Kellerman et al. carriage study were previously reported [21].6Where ST is given, this isolate was previously characterized [12]. Where no ST is given, MLST data is to be published elsewhere.7There is no Z PCR serogrouping assay currently in use in the CDC Meningitis Laboratory. However, this isolate tested negative by rt-PCR for serogroup A, B, C, W135, X, and Y genes.8There is no 29E PCR serogrouping assay currently in use in the CDC Meningitis Laboratory. However, this isolate tested negative by rt-PCR for serogroup A, B, C, W135, X, and Y genes.