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
vte
Staph aureus (MSSA, MRSA, CA-MRSA)
Staph epidermidis
Staph saprophyticus
Staph lugdunensis
Staph haemolyticus
Neisseria meningitides (meningococcus)
Neisseria gonorrhoeae (gonococcus)
Moraxella catarrhalis
E. coli
Klebsiella
Enterobacter
Citrobacter
vte
Penicillin G
Penicillin V
Cefazolin (Ancef)
Cefadroxil
Cephalexin (Keflex)
Streptomycin
Neomycin
Kanamycin
Amikacin
Tobramycin
Spectinomycin
Paromomycin
Doxycycline
Minocycline
Tetracycline
Azithromycin
Clarithromycin
Erythromycin
Ciprofloxacin
Ofloxacin
United States Antibiogram
Microbiology 
Isolation precautions
Labs Checklist
Hemocue
HIV testing 
Cardiac enzymes
Liver function tests