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Antibiotic Sensitivities[1]

Category Antibiotic Serratia sp Serratia marcescens
Penicillins Penicillin G R X1
Penicillin V R X1
Anti-Staphylocccal Penicillins Methicillin R X1
Nafcillin/Oxacillin R X1
Cloxacillin/Diclox. R X1
Amino-Penicillins AMP/Amox R X1
Amox-Clav R X1
AMP-Sulb R X1
Anti-Pseudomonal Penicillins Ticarcillin R X1
Ticar-Clav S X1
Pip-Tazo S X1
Piperacillin S X1
Carbapenems Doripenem S X1
Ertapenem S X1
Imipenem S X1
Meropenem S X1
Aztreonam S X1
Fluroquinolones Ciprofloxacin S X1
Ofloxacin S X1
Pefloxacin S X1
Levofloxacin S X1
Moxifloxacin S X1
Gemifloxacin X1 X1
Gatifloxacin S X1
1st G Cephalo Cefazolin R X1
2nd G. Cephalo Cefotetan S X1
Cefoxitin R X1
Cefuroxime R X1
3rd/4th G. Cephalo Cefotaxime S X1
Cefizoxime S X1
CefTRIAXone S X1
Ceftaroline S X1
CefTAZidime S X1
Cefepime S X1
Oral 1st G. Cephalo Cefadroxil R X1
Cephalexin R X1
Oral 2nd G. Cephalo Cefaclor/Loracarbef R X1
Cefproxil R X1
Cefuroxime axetil R X1
Oral 3rd G. Cephalo Cefixime I X1
Ceftibuten I X1
Cefpodox/Cefdinir/Cefditoren R X1
Aminoglycosides Gentamicin X1 S
Tobramycin X1 S
Amikacin X1 S
Chloramphenicol X1 R
Clindamycin X1 R
Macrolides Erythromycin X1 R
Azithromycin X1 R
Clarithromycin X1 R
Ketolide Telithromycin X1 R
Tetracyclines Doxycycline X1 R
Minocycline X1 R
Glycylcycline Tigecycline X1 S
Daptomycin X1 R
Glyco/Lipoclycopeptides Vancomycin X1 R
Teicoplanin X1 R
Telavancin X1 R
Fusidic Acid X1 R
Trimethoprim X1 R
Urinary Agents Nitrofurantoin X1 R
Fosfomycin X1 S
Other Rifampin X1 R
Metronidazole X1 R
Quinupristin dalfoppristin X1 X1
Linezolid X1 R
Colistimethate X1 R


  • S susceptible/sensitive (usually)
  • I intermediate (variably susceptible/resistant)
  • R resistant (or not effective clinically)
  • S+ synergistic with cell wall antibiotics
  • U sensitive for UTI only (non systemic infection)
  • X1 no data
  • X2 active in vitro, but not used clinically
  • X3 active in vitro, but not clinically effective for Group A strep pharyngitis or infections due to E. faecalis
  • X4 active in vitro, but not clinically effective for strep pneumonia

Table Overview

See Also


  1. Sanford Guide to Antimicrobial Therapy 2014