UCSF Adult Inpatient Susceptibility Data (Gram-Negatives)1 

R-testing not applicable to organism and should be considered resistant, CFPM-cefepime, CIP-ciprofloxacin, CTAZ-ceftazidime, CTRX-ceftriaxone, ERTA-ertapenem, IMI-imipenem-cilastatin, MER-meropenem, P/T-piperacillin-tazobactam, TOB-tobramycin

Total isolates include floor isolates and ICU isolates from Parnassus, MB Adult, and MZ 
Reported as % susceptible, tested from all sites except as indicated 

Organism 
Total Isolates 
CFPM 
CIP 
CTAZ 
CTRX 
ERTA 
IMI/MER2 
P/T 
TOB 

Weighted average 

2261 

86 

74

84 

62 (77)3 

78 (97)3

964 

85 

89 

Citrobacter freundii 

57 

98 

84

N/A

N/A

98 

96

N/A

87 

Enterobacter cloacae 

151 

88 

90 

N/A

N/A

89 

94 

N/A

92 

Escherichia coli 

867

83 

64 

87 

76 

99 

99 

91 

86 

Klebsiella aerogenes 

66 

98 

95

N/A

N/A

98 

96 

N/A

96 

Klebsiella oxytoca 

110 

82 

79

83 

73

95 

96 

80 

79 

Klebsiella pneumoniae 

318

83 

74 

83 

77 

96 

98 

81 

84 

Proteus mirabilis 

164 

93 

74 

98 

90 

100 

98

98 

86 

Pseudomonas aeruginosa 

443 

85 

79 

85 

N/A 

N/A 

89 

76 

97 

Serratia marcescens 

85

100 

92 

100 

97 

98 

96 

98 

95 

1Adult inpatient susceptibilities include data from 4/1/2023-3/31/2024; 2Reflects % susceptibility for imipenem-cilastatin in all situations except for Proteus mirabilis, where % susceptibility for meropenem (non-urine isolates, 67 total isolates) is reported; 3Parentheses excludes Pseudomonas isolates; 4Weighted average excludes 164 Proteus mirabilis isolates tested against imipenem