Gram-negative bacteria: Difference between revisions

Revision as of 13:10, 20 August 2020

Bacteria that have a thin peptidoglycan layer in the cell wall and therefore stain pink or red on Gram stain
Outer membrane contains lipopolysaccharide (LPS, which consists of lipid A, core polysaccharide, and O antigen)

Organisms

Bacilli

Lactose		Oxidase	Urease
fermenter	fast			Escherichia coli, Klebsiella species, Enterobacter species
fermenter	slow			Citrobacter species, Serratia species
non-fermenter		positive		Pseudomonas species, Burkholderia species
		negative	positive	Helicobacter pylori, Proteus mirabilis
		negative	negative	Campylobacter species, Shigella species, Salmonella species, Yersinia species

Cocci

Neisseria species
- Neisseria meningitidis
- Neisseria gonorrheae

Coccobacilli

Haemophilus species (S. aureus satellite colonies)
Pasteurella species
Brucella species
Bordatella pertussis
Francisella tularensis
Legionella species

Anaerobes

@@ Line 1: / Line 1: @@
-* Bacteria that have a '''thin peptidoglycan layer''' in the cell wall and therefore stain '''pink or red''' on [[Gram stain]]
+*Bacteria that have a '''thin peptidoglycan layer''' in the cell wall and therefore stain '''pink or red''' on [[Gram stain]]
-* Outer membrane contains lipopolysaccharide (LPS, which consists of lipid A, core polysaccharide, and O antigen)
+*Outer membrane contains lipopolysaccharide (LPS, which consists of lipid A, core polysaccharide, and O antigen)
-== Organisms ==
+==Organisms==
-* Bacilli
+=== Bacilli ===
+{| class="wikitable"
-** Lactose-fermenting
+! colspan="2" |Lactose
-*** Fast fermenters
+!Oxidase
-**** [[Escherichia coli]]
+!Urease
-**** [[Klebsiella species]]
+!
-**** [[Enterobacter species]]
+|-
-*** Slow fermenters
+| rowspan="2" |fermenter
-**** [[Citrobacter species]]
+|fast
-**** [[Serratia species]]
+| colspan="2" rowspan="2" |
-** Non-lactose-fermenting
+|[[Escherichia coli]], [[Klebsiella species]], [[Enterobacter species]]
-*** Oxidase-positive
+|-
-**** [[Pseudomonas species]]
+|slow
-**** [[Burkholderia species]]
+|[[Citrobacter species]], [[Serratia species]]
-*** Oxidase-negative
+|-
-**** Urease-positive
+| colspan="2" rowspan="3" |non-fermenter
-***** [[Helicobacter pylori]]
+|positive
-***** [[Proteus mirabilis]]
+|
-**** Urease-negative
-***** [[Campylobacter species]]
+|[[Pseudomonas species]], [[Burkholderia species]]
+|-
-***** [[Shigella species]]
+|negative
-***** [[Salmonella species]]
+|positive
-***** [[Yersinia species]]
+|[[Helicobacter pylori]], [[Proteus mirabilis]]
-* Cocci
+|-
-** Neisseria
+|negative
-*** [[Neisseria meningitidis]]
+|negative
-*** [[Neisseria gonorrheae]]
+|[[Campylobacter species]], [[Shigella species]], [[Salmonella species]], [[Yersinia species]]
-* Coccobacilli
+|}
-** [[Haemophilus species]] (''S. aureus'' satellite colonies)
-** [[Pasteurella species]]
+=== Cocci ===
-** [[Brucella species]]
-** [[Bordatella pertussis]]
-** [[Francisella tularensis]]
+*[[Neisseria species]]
-** [[Legionella species]]
+**[[Neisseria meningitidis]]
+**[[Neisseria gonorrheae]]
-* Anaerobes
-** [[Bacteroides species]]
+=== Coccobacilli ===
+*[[Haemophilus species]] (''S. aureus'' satellite colonies)
+*[[Pasteurella species]]
+*[[Brucella species]]
+*[[Bordatella pertussis]]
+*[[Francisella tularensis]]
+*[[Legionella species]]
+=== Anaerobes ===
+*[[Bacteroides species]]
+*[[Fusobacterium species]]
 [[Category:Gram-negative bacteria]]