Table 1.
Number of sib genes in various enteric strains
| Strain | Number of genes | Genes presenta |
|---|---|---|
| E. coli K-12 MG1655 | 5 | A, B, C, D, E |
| E. coli K-12 W3110 | ||
| E. coli 0157:H7 EDL933 | 7 | A, B, B2, C, C2, D, E |
| E. coli 0157:H7 VT-2 Sakai | ||
| E. coli CFT073 (UPEC)b | 4 | A, B, C, D |
| E. coli 01:K1 (APEC) | ||
| Shigella boydii Sb227 | 7 | A, B, B2, C, C2, D, E |
| Shigella sonnei Ss046 | ||
| Shigella flexneri 2a 2457Tc | 5 | C, C2, D, D2, E |
| Shigella dysenteriae Sd197 | 3 | C, D, E |
| Salmonella typhimurium LT2d | 3 | A, C, D |
| Citrobacter koseri ATCC BAA-895 | 1 | A |
a
The A, B, C, D, E designation comes from the original QUAD nomenclature with A and B flanked by yegL and mdtA, C flanked by ygfA and serA and D and E flanked by yqiK and rfaE. “2” refers to a duplicated gene.
b
Two additional UPEC strains, 06:K15:H31 (str.536) and UT189 contain the same four genes.
c
Two additional S. flexneri strains, 2a str. 301 and 5 str. 840f1 contain the same five genes.
d
Salmonella enterica serovar Typhi CT18, S. enterica serovar Typhi T2, S. enterica Paratypi, and S. enterica Choleraesuis contain the same three genes.