Table 1.
Differences between PCR and traditional serotyping (TS) for O group determination among serogroups.
| PCR-O Group | #Isolates Serotyped | Isolates PCR = TS O Group (%) | SEM 1 | Predominant Mismatches (#of Isolates) | #Mismatched O Groups by Serotyping |
#H Groups by TS of Mismatched O Groups |
|---|---|---|---|---|---|---|
| O26 | 115 | 62.6 a | 4.5 | NA 2 | 34 | 22 |
| O45 | 116 | 69.8 a | 4.3 | O110:H31 (13) | 21 | 16 |
| O103 | 116 | 89.0 b | 2.9 | NA | 8 | 6 |
| O111 | 39 | 95.0 b | 3.5 | NA | 1 | 1 |
| O121 | 115 | 91.4 b | 8.6 | NA | 9 | 9 |
| O145 | 79 | 92.4 b | 7.6 | NA | 6 | 5 |
| O157 | 109 | 83.9 b | 3.5 | O71: H32 (3) | 13 | 9 |
| Total | 689 | 83.0 | − | NA | 92 | 68 |
a,b Means in a column with different superscripts differ (p < 0.05). 1 SEM, standard error of the mean. 2 NA, not applicable as mismatches were not repeated (n < 3 per mismatch). a,b Means in a column with different superscripts differ (p < 0.05).