Gram positive/negative bacteria

Gram-positive bacteria

Gram-positive bacteria are characterized by a thick peptidoglycan cell wall that retains crystal violet stain (appearing purple) and lacks an outer membrane.

Types of gram-positive bacteria

Cocci (spherical) and rods (bacilli)

Gram-positive bacteria: name two cocci bacteria

staphylococcus and streptococcus

Staphylococcus aureus

Gram-positive bacteria

coagulase +

staphylococcus epidermidis

gram-positive bacteria

coagulase -

Streptococcus pyogenes (Group A)

Gram-positive cocci (lanceolate chains)

Streptococcus agalactiae (Group B)

Gram-positive cocci (lanceolate chains)

streptococcus dysgalacticae (group C and G)

Gram-positive cocci (lanceolate chains)

enterococcus spp (Group D)

Gram-positive cocci (lanceolate chains)

entercoccus faecalis

Gram-positive cocci (chains or pairs)

what are the Gram-positive rods

clostridum, listeria monocytogenes, bacillus, mycobacterium

clostridium (anaerobic) bacteria

Gram-positive bacteria (bacilli/rods)

listeria monocytogenes bacteria

Gram-positive bacteria (bacilli/rods)

bacillus (anthracus) bacteria

Gram-positive bacteria (bacilli/rods)

mycobacterium bacteria

gram-positive bacteria (bacilli/rods)

actinomyces

gram variable

acid fast, aerobic

nocardia

gram variable

non-acid fast, aerobic

What are Gram-negative bacteria (definition)

Gram-negative bacteria have a thin peptidoglycan laer and an outer membrane containing LPS (endotoxin)

neisseria goorrhoeae (pathogenic)

Gram-negative diplococci (kidney-shaped pairs)

maltose fermenter

oxidase positive

neisseria meningitidis (pathogenic)

Gram-negative diplococci (kidney-shaped pairs)

maltose fermenter

oxidase positive

haemophillus influenzae

gram-negative coccobacilli (short, oval rods)

non spore forming

pasteurella multiocida (zootonic)

gram-negative coccobacilli (short, oval rods)

non spore forming

brucella species (zootonic)

gram-negative coccobacilli (short, oval rods)

non spore forming

bordetella pertussis (zootonic)

Gram-negative coccobacilli (short, oval rods)

non spore forming

klebisella pneumoniae

Gram-negative rod-shaped bacteria that are lactose fermenters

e. coli

Gram-negative rod-shaped bacteria that are lactose fermenters

enterobacter species

Gram-negative rod-shaped bacteria that are lactose fermenters

shisella species

Gram-negative rod-shaped bacteria that are NON-lactose fermenters and oxidase NEGATIVE

salmonella species

Gram-negative rod-shaped bacteria that are NON-lactose fermenters and oxidase NEGATIVE

proteus species

Gram-negative rod-shaped bacteria that are NON-lactose fermenters and oxidase NEGATIVE

Pseudomonas aeruginosa

Gram-negative rod-shaped bacteria that are NON-lactose fermenters and oxidase POSITIVE

Campylobacter jejuni

gram-negative curved rod

vibrio species

gram-negative curved rod