 (2005b) identified a novel Ambler class A beta-lactamase called CSP-1 from a NOR "C. sputigena" strain, resistant to amoxicillin and first and second generation cephalosporins.The new beta- lactamase had 32% homology with CfxA, 41% with CblA and 38% with CepA.CSP-1 is encoded by the blaCSP -1 gene (GenBank nucleotide sequence under accession number GQ217533).