Table 2.
Susceptibility results of common Gram-negative bacteria to select antimicrobial agents
| % isolates susceptible (no. isolates reported) | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Organism/region (no. isolates tested) | AMK | AMP | SAM | AZM | CFZ | FEP | CFT | CIP | GEN | MEM | MXF | NIT | TZP | TGC | TOB | SXT |
| Escherichia coli | ||||||||||||||||
| All (18,812) | 99 (18,475) | 48 (18,475) | 56 (18,475) | 93 (11,881) | 87 (14,583) | 95 (18,475) | 94 (18,524) | 70 (17,614) | 88 (18,475) | 100 (13,780) | 71 (8,138) | 90 (17,749) | 94 (17,277) | 99 (14,500) | 90 (17,277) | 74 (18,812) |
| Central (2,195) | 100 (2,195) | 47 (2,195) | 58 (2,195) | 93 (2,195) | 85 (2,195) | 94 (2,195) | 92 (2,195) | 65 (2,195) | 89 (2,195) | 100 (2,195) | 69 (2,195) | 93 (2,195) | 93 (2,195) | 100 (2,195) | 90 (2,195) | 73 (2,195) |
| Northwest (3,291) | 100 (3,291) | 47 (3,291) | 58 (3,291) | 95 (3,291) | 88 (2,851) | 95 (3,291) | 94 (3,291) | 69 (2,690) | 87 (3,291) | 100 (2,851) | 72 (2,082) | 88 (3,291) | 91 (2,690) | 98 (2,082) | 90 (2,690) | 77 (3,291) |
| Northeast (4,919) | 99 (4,919) | 49 (4,919) | 58 (4,919) | 93 (4,919) | 85 (4,919) | 94 (4,919) | 92 (4,919) | 64 (4,653) | 90 (4,919) | 100 (4,296) | 63 (3,096) | 85 (4,770) | 93 (4,653) | 100 (2,970) | 88 (4,653) | 72 (4,919) |
| Southwest (8,824) | 99 (8,487) | 49 (8,487) | 54 (8,487) | 93 (1,893) | 88 (4,595) | 97 (8,487) | 96 (8,536) | 76 (8,493) | 87 (8,487) | 99 (4,785) | 95 (1,182) | 93 (7,910) | 96 (8,156) | 99 (7,670) | 90 (8,156) | 75 (8,824) |
| Southeast (496) | 99 (496) | 51 (496) | 62 (496) | 93 (496) | 96 (496) | 89 (496) | 95 (496) | 89 (496) | 74 (496) | 100 (126) | 95 (496) | 79 (126) | 90 (126) | 95 (496) | 98 (496) | 93 (496) |
| Pseudomonas aeruginosa | ||||||||||||||||
| All (5,317) | 94 (5,317) | - | - | 63 (3,719) | - | 80 (5,129) | - | 71 (4,666) | 78 (5,317) | 86 (4,709) | - | - | 86 (4,704) | - | 94 (4,704) | - |
| Central (951) | 96 (951) | - | - | 63 (951) | - | 80 (951) | - | 76 (951) | 81 (951) | 86 (951) | - | - | 86 (951) | - | 96 (951) | - |
| Northwest (757) | 97 (757) | - | - | 67 (757) | - | 84 (649) | - | 65 (507) | 78 (757) | 89 (649) | - | - | 83 (507) | - | 90 (507) | - |
| Northeast (1,483) | 94 (1,483) | - | - | 62 (1,483) | - | 78 (1,483) | - | 64 (1,387) | 76 (1,483) | 84 (1,427) | - | - | 83 (1,387) | - | 92 (1,387) | - |
| Southwest (2,106) | 93 (2,106) | - | - | 63 (508) | - | 80 (2,004) | - | 77 (1,779) | 77 (2,106) | 88 (1,640) | - | - | 91 (1,817) | - | 95 (1,817) | - |
| Southeast (142) | 96 (142) | - | - | 64 (142) | - | 84 (56) | - | 75 (56) | 77 (142) | 89 (56) | - | - | 83 (56) | - | 95 (56) | - |
| Proteus mirabilis | ||||||||||||||||
| All (4,566) | 100 (4,511) | 83 (4,511) | 90 (4,511) | 89 (3,357) | 86 (3,734) | 90 (4,511) | 91 (4,537) | 69 (4,189) | 93 (4,511) | 100 (3,980) | 64 (2,315) | - | 97 (3,878) | - | 96 (3,878) | 76 (4,566) |
| Central (641) | 100 (641) | 88 (641) | 89 (641) | 88 (641) | 84 (641) | 85 (641) | 85 (641) | 65 (641) | 98 (641) | 100 (641) | 65 (641) | - | 97 (641) | - | 98 (641) | 74 (641) |
| Northwest (725) | 100 (725) | 84 (725) | 90 (725) | 93 (725) | 91 (644) | 91 (725) | 91 (725) | 70 (580) | 91 (725) | 100 (725) | 73 (448) | - | 99 (499) | - | 95 (499) | 75 (725) |
| Northeast (1,442) | 100 (1,442) | 72 (1,442) | 89 (1,442) | 85 (1,442) | 80 (1,442) | 83 (1,442) | 85 (1,442) | 56 (1,358) | 95 (1,442) | 100 (1,236) | 50 (999) | - | 95 (1,358) | - | 97 (1,358) | 67 (1,442) |
| Southwest (1,840) | 99 (1,785) | 88 (1,785) | 91 (1,785) | 94 (631) | 93 (1,086) | 98 (1,785) | 97 (1,811) | 80 (1,692) | 91 (1,785) | 100 (1,538) | 97 (309) | - | 99 (1,459) | - | 95 (1,459) | 84 (1,840) |
| Southeast (107) | 100 (107) | 72 (107) | 86 (107) | 76 (107) | 80 (29) | 74 (107) | 75 (107) | 66 (107) | 66 (107) | 100 (29) | 90 (107) | - | 100 (29) | - | 100 (29) | 92 (107) |
| Organism/region (no. isolates tested) | AMK | AMP | SAM | AZM | CFZ | FEP | CFT | CIP | GEN | MEM | MXF | NIT | TZP | TGC | TOB | SXT |
| Klebsiella pneumoniae | ||||||||||||||||
| All (6,848) | 93 (6,806) | - | 79 (6,806) | 84 (5,087) | 84 (5,895) | 88 (6,806) | 88 (6,840) | 87 (6,435) | 94 (6,806) | 93 (5,627) | 79 (3,957) | - | 89 (6,259) | 94 (5,530) | 89 (6,393) | 85 (6,848) |
| Central (1,422) | 90 (1,275) | - | 75 (1,275) | 87 (1,275) | 81 (1,275) | 89 (1,275) | 88 (1,275) | 85 (1,275) | 96 (1,275) | 94 (1,275) | 86 (1,275) | - | 89 (1,275) | 96 (1,275) | 87 (1,275) | 84 (1,275) |
| Northwest (1,101) | 97 (1,101) | - | 84 (1,101) | 91 (1,101) | 88 (906) | 91 (1,101) | 91 (1,101) | 90 (946) | 97 (1,101) | 98 (906) | 91 (839) | - | 93 (751) | 96 (839) | 93 (946) | 90 (1,101) |
| Northeast (1,687) | 89 (2,204) | - | 75 (2,204) | 81 (2,204) | 78 (2,204) | 83 (2,204) | 81 (2,204) | 80 (2,094) | 89 (2,204) | 88 (2,052) | 71 (1,666) | - | 86 (2,094) | 92 (1,618) | 81 (2,094) | 81 (2,204) |
| Southwest (2,414) | 97 (2,372) | - | 84 (2,372) | 84 (653) | 91 (1,595) | 94 (2,372) | 94 (2,406) | 94 (2,266) | 96 (2,372) | 96 (1,479) | 80 (323) | - | 91 (2,224) | 95 (1,944) | 97 (2,224) | 89 (2,414) |
| Southeast (224) | 84 (224) | - | 68 (224) | 79 (224) | 95 (90) | 77 (224) | 82 (224) | 80 (224) | 79 (224) | 97 (90) | 84 (224) | - | 100 (90) | 82 (224) | 94 (224) | 80 (224) |
| Serratia marcescens | ||||||||||||||||
| All (991) | 99 (954) | - | - | 97 (632) | - | 99 (917) | 97 (954) | 93 (971) | 97 (954) | 99 (863) | - | - | 91 (917) | 96 (920) | 93 (954) | 98 (971) |
| Central (319) | 99 (319) | - | - | 98 (319) | - | 99 (319) | 97 (319) | 91 (319) | 99 (319) | 100 (319) | - | - | 93 (319) | 96 (319) | 98 (319) | 99 (319) |
| Northwest (65) | 100 (65) | - | - | 99 (65) | - | 100 (65) | 99 (65) | 92 (65) | 100 (65) | 100 (65) | - | - | 100 (65) | 100 (65) | 99 (65) | 95 (65) |
| Northeast (231) | 100 (231) | - | - | 96 (231) | - | 99 (231) | 96 (231) | 93 (231) | 97 (231) | 99 (227) | - | - | 94 (231) | 96 (197) | 93 (231) | 99 (231) |
| Southwest (376) | 100 (359) | - | - | 89 (37) | - | 98 (322) | 97 (359) | 95 (376) | 96 (359) | 99 (272) | - | - | 86 (322) | 95 (359) | 87 (359) | 96 (376) |
| Southeast (0) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Enterobacter aerogenes | ||||||||||||||||
| All (824) | 100 (790) | - | - | 83 (493) | - | 99 (763) | 83 (493) | 93 (802) | 99 (790) | 99 (657) | - | - | 81 (763) | 97 (749) | 99 (790) | 96 (802) |
| Central (216) | 100 (216) | - | - | 84 (216) | - | 99 (216) | 84 (216) | 95 (216) | 99 (216) | 99 (216) | - | - | 76 (216) | 96 (216) | 99 (216) | 97 (216) |
| Northwest (69) | 100 (69) | - | - | 82 (69) | - | 100 (69) | 79 (69) | 94 (69) | 100 (69) | 100 (69) | - | - | 73 (69) | 96 (69) | 100 (69) | 97 (69) |
| Northeast (203) | 100 (203) | - | - | 82 (203) | - | 100 (203) | 82 (203) | 88 (203) | 98 (203) | 99 (186) | - | - | 78 (203) | 99 (162) | 98 (203) | 93 (203) |
| Southwest (336) | 100 (324) | - | - | 85 (27) | - | 99 (297) | 100 (27) | 96 (336) | 99 (324) | 100 (208) | - | - | 89 (297) | 97 (324) | 99 (324) | 97 (336) |
| Southeast (0) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Organism/region (no. isolates tested) | AMK | AMP | SAM | AZM | CFZ | FEP | CFT | CIP | GEN | MEM | MXF | NIT | TZP | TGC | TOB | SXT |
| Enterobacter cloacae | ||||||||||||||||
| All (1,795) | 100 (1,773) | - | - | 78 (1,293) | - | 96 (1,711) | 77 (1,295) | 86 (1,692) | 95 (1,773) | 99 (1,551) | 86 (988) | - | 76 (1,608) | 93 (1,462) | 95 (1,670) | 87 (1,795) |
| Central (388) | 100 (388) | - | - | 80 (388) | - | 98 (388) | 80 (388) | 93 (388) | 98 (388) | 100 (388) | 95 (388) | - | 82 (388) | 96 (388) | 98 (388) | 96 (388) |
| Northwest (350) | 100 (350) | - | - | 66 (350) | - | 95 (324) | 64 (350) | 62 (309) | 89 (350) | 99 (324) | 66 (247) | - | 49 (283) | 87 (247) | 87 (309) | 77 (350) |
| Northeast (456) | 100 (456) | - | - | 82 (456) | - | 98 (456) | 81 (456) | 89 (427) | 96 (456) | 100 (436) | 89 (342) | - | 84 (427) | 94 (316) | 96 (427) | 85 (456) |
| Southwest (627) | 100 (605) | - | - | 84 (125) | - | 94 (568) | 91 (127) | 92 (594) | 95 (605) | 99 (428) | 100 (37) | - | 78 (535) | 94 (537) | 96 (572) | 88 (627) |
| Southeast (65) | 100 (25) | - | - | 80 (25) | - | - | 96 (25) | 84 (25) | 96 (25) | - | 96 (25) | - | - | 80 (25) | 88 (25) | 100 (25) |
| Acinetobacter baumannii | ||||||||||||||||
| All (1,100) | 67 (505) | - | 75 (870) | - | - | 40 (823) | - | 40 (734) | 51 (1,045) | 50 (737) | - | - | 39 (71) | - | 63 (884) | 51 (1,058) |
| Central (222) | 50 (126) | - | 77 (222) | - | - | 35 (222) | - | 36 (222) | 50 (222) | 47 (222) | - | - | - | - | 57 (222) | 49 (222) |
| Northwest (144) | 65 (72) | - | 66 (144) | - | - | 45 (144) | - | 45 (108) | 60 (144) | 82 (108) | - | - | 41 (36) | - | 88 (108) | 55 (144) |
| Northeast (409) | 56 (96) | - | 77 (409) | - | - | 27 (246) | - | 20 (201) | 42 (409) | 39 (333) | - | - | 11 (20) | - | 48 (364) | 41 (409) |
| Southwest (279) | 84 (211) | - | 66 (144) | - | - | 57 (211) | - | 63 (203) | 70 (233) | 79 (37) | - | - | 73 (15) | - | 82 (190) | 68 (246) |
| Southeast (46) | - | - | 78 (37) | - | - | - | - | - | 8 (37) | 38 (37) | - | - | - | - | - | 48 (37) |
Abbreviations: AMK amikacin, AMP ampicillin, SAM ampicillin/sulbactam, AZM aztreonam, CFZ cefazolin, FEP cefepime, CFT ceftriaxone, CIP ciprofloxacin, GEN gentamicin, IMI imipenem, MEM meropenem, MXF moxifloxacin, NIT nitrofurantoin, TZP piperacillin/tazobactam, TGC tigecycline, TOB tobramycin, SXT trimethoprim/sulfamethoxazole.