Table 2.
Overall and serogroup-specific meningococcal carriage among carriage evaluation participants at an Oregon university, March 2015–February 2016
| Round 1: March 2015, N (%) | Round 2: May 2015, N (%) | Round 3: October 2015, N (%) | Round 4: February 2016, N (%) | TotalN (%) | |
|---|---|---|---|---|---|
| N. meningitidis carriage | 167 (14) | 183 (17) | 110 (11) | 163 (17) | 622 (15) |
| Serogroup | |||||
| Genotypic (rt-PCR)1 | |||||
| B | 14 (1.2) | 23 (2.3) | 20 (1.9) | 22 (2.4) | 78 (1.8) |
| C | 3 (0.26) | 1 (0.09) | 3 (0.29) | 1 (0.11) | 8 (0.19) |
| W | 2 (0.17) | 0 (0) | 0 (0) | 1 (0.11) | 3 (0.07) |
| X | 1 (0.09) | 1 (0.09) | 0 (0) | 0 (0) | 2 (0.05) |
| Y | 3 (0.26) | 2 (0.19) | 3 (0.29) | 5 (0.53) | 13 (0.31) |
| Nongroupable | 144 (12) | 156 (15) | 84 (8.0) | 134 (14) | 510 (12) |
| Phenotypic (SASG)1 | |||||
| B | 3 (0.26) | 5 (0.47) | 3 (0.29) | 5 (0.53) | 16 (0.38) |
| W | 1 (0.09) | 0 (0) | 0 (0) | 1 (0.11) | 2 (0.05) |
| X | 0 (0) | 1 (0.09) | 0 (0) | 0 (0) | 3 (0.07) |
| Y | 1 (0.09) | 0 (0) | 0 (0) | 3 (0.32) | 5 (0.12) |
| Other | 162 (14) | 177 (17) | 107 (10) | 154 (16) | 577 (14) |
| Total participants | 1173 | 1069 | 1045 | 938 | 4225 |
1
Real time PCR (rt-PCR) and slide agglutination (SASG) both tested for serogroups A, B, C, W, X, and Y. For SASG, isolates were classified as “Other” if serogroup A, B, C, W, X, and Y capsule antigens were not detected; this classification includes phenotypically nongroupable bacteria as well as serogroups E and Z, which are rarely associated with disease. For rt-PCR, isolates were classified as nongroupable if serogroup A, B, C, W, X, and Y biosynthesis genes were not detected.