Organism Groups

Staphylococcus aureus complex

S. aureus

S. argentus 

Staphylococci spp

Methicillin susceptible S. aureus - MSSA
Methicillin resistant S. aureus - MRSA
Vancomycin intermediate S. aureus - VISA
Vancomycin resistant S. aureus - VRSA
Coagulase negative staphylococci - CoNS

Viridans group Streptococci

Streptococcus anginosus group
- S. anginosus
- S. constellatus
- S. intermedius
Streptococcus mitis group
Streptococcus mutans group
Streptococcus salivarius group
Streptococcus bovis/equinus group
- S. gallolyticus
- S. infantarius

- S. lutetiensis

- S. pasteurianus

Streptococcus pneumoniae

   Penicillin susceptible (Pen-S)

MIC:
≤ 2µg/mL (parenteral-nonmeningitis)
≤ 0.06µg/mL (parenteral-meningitis)
≤ 0.06µg/mL - oral penicillin

   Penicillin intermediate (Pen-I)

MIC:
4µg/mL - parenteral-nonmeningitis
0.12-1µg/mL - oral penicillin

   Penicillin resistant (Pen-R)

MIC:
≥ 8µg/mL - parenteral-nonmeningitis
≥ 0.12µg/mL - parenteral-meningitis
≥ 2µg/mL - oral penicillin

ß-haemolytic Streptococci

S. pyogenes (Group A)
S. agalactiae (Group B)
S. dysgalactiae/S. equi (Group C/G) 

Streptococci spp (zoonotic)

S. canis

S. equi subsp zooepidemicus

S. halichoeri

S. minor

S. suis

Enterococcus spp

E. avium group

E. caccae
E. casseliflavus
E. dispar

E. durans
E. faecalis
E. faecium
E. gallinarum
E. hirae

E. mundtii

E. pallens

Vancomycin resistant enterococci - VRE

Coryneform bacteria

Arthrobacter spp
Brevibacterium spp
Cellulomonas spp
Dermabacter spp
Microbacterium spp
Turicella spp
Oerskovia spp
Curtobacterium spp
Exiguobacterium spp

Enterobacterales

Cedecea spp

Citrobacter amalonaticus complex
Citrobacter freundii complex
Citrobacter koseri
Citrobacter sedlakii
Cronobacter spp
Edwardsiella spp
Enterobacter cloacae complex

Erwinia spp

Escherichia coli

Ewingella spp
Hafnia spp

Klebsiella aerogenes
Klebsiella oxytoca complex
Klebsiella pneumoniae/variicola

Kluyvera spp
Morganella morganii
Pantoea spp
Proteus mirabilis
Proteus vulgaris complex (P. vulgaris, P. hauseri, P. penneri)
Providencia spp (P. rettgeri, P. stuartii, P. vermicola)
Raoultella spp (R. ornithiolytica, R. terrigena, R. planticola)

Rahnella spp
Salmonella spp
Serratia spp
Shigella spp
Yersinia spp

Enterobacterales that produce cephalosporinases

AmpC cephalosporinase:
Enterobacter spp
Citrobacter freundii complex
Hafnia spp

Klebsiella aerogenes
Serratia spp
Morganella spp
Providencia spp

Class A cephalosporinase:
Proteus vulgaris complex

Other fermenting Gram negative bacilli

Aeromonas spp

Plesiomonas spp

Vibrio species

Aerobic Gram negative bacilli - nonfermenters

Achromobacter spp

Acidovorax spp
Acinetobacter spp

Advenella spp

Agrobacterium spp
Alcaligenes spp
Bordetella spp (other than B. pertussis)
Brevundimonas spp

Burkholderia spp

Chromobacterium spp
Chryseobacterium spp
Comamonas spp

Cupriavidus spp

Delftia spp
Elizabethkingia spp

Empedobacter spp

Kertersia spp

Methylobacterium spp/Methylorubrum spp

Moraxella catarrhalis
Moraxella spp (other than M. catarrhalis)
Myroides spp
Ochrobactrum spp
Oligella spp

Pandoraea spp

Paracoccus spp
Pseudomonas spp
Ralstonia spp
Rhizobium spp
Roseomonas spp
Shewanella spp
Sphingobacterium spp

Sphingobium spp
Sphingomonas spp

Stenotrophomonas maltophilia

Fastidious Gram negatives

Actinobacillus spp

Aggregatibacter spp

Bergeyella spp

Brucella spp

Campylobacter spp

Capnocytophaga spp

Cardiobacterium spp

Dysgomonas spp

Eikenella spp

Francisella spp

Haemophilus spp

Helicobacter spp

Kingella spp

Mannheimia spp

Neisseria spp

Pasteurella spp

Suttonella spp

Weeksella spp