TABLE 1

Occurrences of ESBL, acquired cephalosporinases (AmpC), and carbapenemase enzymes detected among 701 ESBL-phenotype-positive strains collected in U.S. hospitals by U.S. census regions

Region (no. of isolates tested)No. of isolates (% of isolates tested by region) positive fora:
CTX-M-15-likeSHV ESBLKPCCTX-M-14-likeCMY-2-likeFOXTEM ESBLDHA
Overall (701)303 (43.2)176 (25.1)118 (16.8)72 (10.3)64 (9.1)10 (1.4)9 (1.3)7 (1.0)
New England (47)19 (40.4)9 (19.1)1 (2.1)5 (10.6)6 (12.8)2 (4.3)
Mid-Atlantic (143)50 (35.0)42 (29.4)58 (40.6)11 (7.7)15 (10.5)2 (1.4)2 (1.4)1 (0.7)
East North Central (99)50 (50.5)18 (18.2)13 (13.1)7 (7.1)6 (6.1)
West North Central (24)9 (37.5)1 (4.2)1 (4.2)4 (16.7)5 (20.8)2 (8.3)
South Atlantic (110)45 (40.9)37 (33.6)18 (16.4)10 (9.1)4 (3.6)3 (2.7)2 (1.8)
East South Central (39)10 (25.6)11 (28.2)1 (2.6)3 (7.7)2 (5.1)4 (10.3)1 (2.6)
West South Central (109)67 (61.5)30 (27.5)14 (12.8)9 (8.3)12 (11.0)1 (0.9)2 (1.8)
Mountain (56)27 (48.2)10 (17.9)8 (14.3)9 (16.1)6 (10.7)
Pacific (74)26 (35.1)18 (24.3)4 (5.4)14 (18.9)8 (10.8)2 (2.7)2(2.7)
  • a Various isolates were positive for one or more β-lactamase-encoding genes tested.