Gram-negative bacteria: Difference between revisions

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