Gram + algorithim Flashcards
Gram + branching aerobe
Nocardia
Gamma hemolytic strep
GDS (Enterococcus)
Non-enterococcus (S. bovis)
(No hemolysis)
Enterococcus vs. Strep bovis
Enterococcus = growth in bile and 6.5% NaCl
Strep bovis = growth in bile but not 6.5% NaCl
G+ encapsulated
Pneumococcus
GBS
Gram + rod acid fast
Mycobacterium
Alpha hemolytic strep
Pneumococcus
Viridans strep
(green, incomplete hemolysis)
G+ yellow pigment
S. aureus
Gram + branching acid fast
Nocardia
G+ cocci catalse -
Strep
G+ branching filaments
Nocardia
Actinomyces
G+ yellow granules
Actinomyces
S. pyogenes
G+ coccus, catalse -, beta hemolytic, Bacitracin sensitive
Listeria
G+ rod exotoxin producer
G+ cocci exotoxin producers
S. aureus
GAS
Pneumococcus
G+ coccus, catalse -, alpha hemolytic, doesn’t grow in optochin or bile
Gram + rod catalse +
Listeria
G+ cocci catalse + coagulase -
S. epidermidis
S. saprophyticus
G+ with IgA protease
Pneumococcus
G+ cocci
Staph or strep
S. saprophyticus
G + cocci catalse + coagulase - Novobiocin resistant
S. mutans
G+ coccus, catalse -, grows in bile and optochin
Corynebacterium
G+ rod
Clostridium
G+ rod anaerobe toxin producers
Novobiocin resistant
S. saprophyticus
G+, catalse -, bacitracin resistant
GBS (also beta hemolytic)
Pneumococcus vs. viridans strep
Both alpha hemolytic (green, incomplete)
Pneumococcus = capsule, bile sensitive, optochin sensitive
Viridans strep = no capsule, bile resistant, optochin resistant
G+ cocci, catalse -, bacitracin sensitive
GAS (also beta hemolytic)
Nocardia
G+ branching, acid fast aerobe
Gram + rod anaerobe
Clostridium
Gram + rod produces exotoxin
Listeria (listeriolysin)
C. perfringens (alpha toxin)
C. diphtheria
C. tetani (tetatnospasmin)
C. botulinum
G+ with M protein
GAS
Novobiocin resistant
S. saprophyticus
G+ cocci coagulase + catalse +
S. aureus
S. epidermidis
G + cocci catalse + coagulase - Novobiocin sensitive
G+ with special stains
G+ cocci, catalse -, grows in bile but not NaCl
S. bovis
(COLON CANCER!)
G+ rods
Listeria
Clostridium
C. diphtheria
Bacillus
Mycobacterium
Gram + acid fast
Nocardia
Gram + rod aerobe
Bacillus
Bacillus
G+ rod aerobe
GAS vs. GBS
Both beta hemolytic (clear, complete)
GAS = bacitracin sensitive
GBS = bacitracin resistant
S. epidermidis vs. S. saprophyticus
Novobiocin resistant = saprophyticus
Novobiocin sensitive = epidermidis
G+ cocci, catalse -, bile sensitive
Pneumococcus
E. faecalis
G+ coccus, catalse -, gamma hemolytic, grows in bile and NaCl
Bacitracin
GAS vs. GBS
Resistant = GBS
Sensitive = GAS
G+ cocci catalse +
Staph
G+ with lysogenic phage-encoded exotoxins
Clostridium botulinum
Corynebacterium diphtheria
GAS
Actinomyces
G+ branching anaerobe
G+ cocci, catalse -, grows in bile and NaCl
Enterococcus
S. agalactiae
G+ coccus, catalse -, beta hemolytic, Bacitracin resistant
G+ coccus that’s catalase -, bile resistant, optochin resistant
Viridans strep (also alpha hemolytic)
G+ cocci, catalase -, bile resistant
Enterococcus
Strep bovis
Viridans strep
G+ brancing anaerobe
Actinomyces
Mycobacterium
G+ rod aerobe acid fast
S. aureus
Gram + cocci catalse + coagulase +
G+ urease producers
Nocardia
S. epidermidis
S. saprophyticus
Beta hemolytic strep
GAS
GBS
(Complete hemolysis)
G+ coccus that’s catalse -, bile sensitive, optochin sensitive
Pneumococcus (also alpha hemolytic and has capsule)
G+ with protein A
S. aureus
S. bovis
G+ coccus, catalse -, gamma hemolytic, grows in bile but NOT NaCl