Gram-negative bacteria: Difference between revisions

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Latest revision as of 18:46, 17 February 2022

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, Enterobacter
fermenter	slow			Citrobacter, Serratia
non-fermenter		positive		Pseudomonas, Burkholderia
		negative	positive	Helicobacter pylori, Proteus mirabilis
		negative	negative	Campylobacter, Shigella, Salmonella, Yersinia

Cocci

Neisseria
- Neisseria meningitidis
- Neisseria gonorrheae

Coccobacilli

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

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]]
+!
-**** [[Enterobacter]]
+|-
-*** Slow fermenters
+| rowspan="2" |fermenter
-**** [[Citrobacter]]
+|fast
-**** [[Serratia]]
+| colspan="2" rowspan="2" |
-** Non-lactose-fermenting
+|[[Escherichia coli]], [[Klebsiella]], [[Enterobacter]]
-*** Oxidase-positive
+|-
-**** [[Pseudomonas]] spp.
+|slow
-**** [[Burkholderia]] spp.
+|[[Citrobacter]], [[Serratia]]
-*** Oxidase-negative
+|-
-**** Urease-positive
+| colspan="2" rowspan="3" |non-fermenter
-***** [[Helicobacter pylori]]
+|positive
-***** [[Proteus mirabilis]]
+|
-**** Urease-negative
+|[[Pseudomonas]], [[Burkholderia]]
-***** [[Campylobacter]]
+|-
-***** [[Shigella]]
+|negative
-***** [[Salmonella]]
+|positive
-***** [[Yersinia]]
+|[[Helicobacter pylori]], [[Proteus mirabilis]]
-* Cocci
+|-
-** Neisseria
+|negative
-*** [[N. meningitidis]]
+|negative
-*** [[N. gonorrheae]]
+|[[Campylobacter]], [[Shigella]], [[Salmonella]], [[Yersinia]]
-* Coccobacilli
+|}
-** [[Haemophilus]] (''S. aureus'' satellite colonies)
-** [[Pasteurella]]
+=== Cocci ===
-** [[Brucella]]
-** [[Bordatella pertussis]]
+*[[Neisseria]]
-** [[Francisella tularensis]]
-** [[Legionella]]
+**[[Neisseria meningitidis]]
+**[[Neisseria gonorrheae]]
-* Anaerobes
-** [[Bacteroides]]
+=== Coccobacilli ===
+*[[Haemophilus]] (''S. aureus'' satellite colonies)
+*[[Pasteurella]]
+*[[Brucella]]
+*[[Bordetella pertussis]]
+*[[Francisella tularensis]]
+*[[Legionella]]
+=== Anaerobes ===
+*[[Bacteroides]]
+*[[Fusobacterium]]
 [[Category:Gram-negative bacteria]]