ID Gram+ and Gram- Organisms
Sun, 11/23/2008 - 21:14 — saif
Gram +
I. Rods:
a. Bacillus
b. Listeria
c. Actinomyces
d. Nocardia
e. Clostridium
f. Corynebacterium
II. Cocci
a. catalase+ --> staph
i. -coagulase+ --> s. aureus (b hemolytic)
ii. -coagulase-
1. novobiocin sensitive à s. epidermidis
2. novobiocin resistant à s. saprophyticus
b. catalase- --> strep
i. -a hemolytic (green color)
1. optichin sensitive, quelung+, bile soluble --> strep pneumo
2. optichin resistant, quelung-, bile insol -->viridians strep (s. mutans)
ii. -b hemolytic (clear color)
1. bacitracin sensitive --> group a --> s. pyogenes
2. bacitracin resistant --> group b --> s. aglactiae
iii. -y hemolytic (no hemolysis)
1. enterococcus (E. faecalis)
2. peptostreptococcus (an anaerobe)
Gram –
I. Cocci
a. Maltose fermenter: Neiserria meningitides
b. Maltose nonfermenter: Neiserria gonorrhea
II. Coccoid rods
a. Haemophilus influenzae
b. Pasteurella
c. Brucella
d. Bordetella pertussis
e. Bacteroides
III. Rods
a. Lactose Fermenters
i. Fast fermenters
1. Klebsiella
2. E. coli
3. Enterobacter
ii. Slow fermenters
1. Citrobacter
2. Serratia
b. Lactose Nonfermenters
i. Oxidase Positive
1. pseudomonas
ii. Oxidase negative
1. Proteus
2. Salmonella
3. Shigella