TABLE 3.
Characteristics of CTX-M-type ESBLs
| β-Lactamase | Alternative name | pI | Country of origin | Bacterial species | Reference(s) |
|---|---|---|---|---|---|
| CTX-M-1 | MEN-1 | 8.9 | Germany, Italy | E. coli | 12, 13 |
| CTX-M-2 | 7.9 | Argentina | S. entericaa | 11, 13 | |
| CTX-M-3 | 8.4 | Poland | C. freundii, E. coli | 64 | |
| CTX-M-4 | 8.4 | Russia | S. enterica | 57, 59 | |
| CTX-M-5 | CTX-M-3 | 8.8 | Latvia | S. enterica | 29 |
| CTX-M-6 | 8.4 | Greece | S. enterica | 58, 173 | |
| CTX-M-7 | CTX-M-5 | 8.4 | Greece | S. enterica | 58, 173 |
| CTX-M-8 | 7.6 | Brazil | P. mirabilis, E. cloacae, E. aerogenes, C. amalonaticus | 21 | |
| CTX-M-9 | 8.0 | Spain | E. coli | 148 | |
| CTX-M-10 | 8.1 | Spain | E. coli | Oliver et al.b | |
| Toho-1 | 7.8 | Japan | E. coli | 72 | |
| Toho-2 | 7.7 | Japan | E. coli | 88 |
a
All strains of S. enterica were serovar Typhimurium.
b
A. Oliver, J. C. Pérez-Díaz, T. M. Coque, F. Baquero, and R. Cantón, 40th Intersci. Conf. Antimicrob. Agents Chemother., abstr. 1480, 2000.