Catalase test: Difference between revisions

Revision as of 01:08, 28 July 2020

Used to differentiate a number of bacteria:
- Staphylococcus species (positive) from Streptococcus species and Enterococcus species (negative
- Aerotolerant strains of Clostridium species (negative) from Bacillus species (positive)
- Members of the Enterobacteriaceae family (positive) from other Gram-negative bacilli
Detects the presence of catalase, which catalyzes the conversion of hydrogen peroxide into water and oxygen
Mix a small sample of bacteria with 3% hydrogen peroxide
- Positive if bubbles appears within 10 seconds
- Negative if no or only a few bubbles

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-* Used to differentiate a number of bacteria:
+*Used to differentiate a number of bacteria:
-** [[Staphylococcus species]] (positive) from [[Streptococcus species]] and [[Enterococcus species]] (negative
+**[[Staphylococcus species]] (positive) from [[Streptococcus species]] and [[Enterococcus species]] (negative
-** Aerotolerant strains of [[Clostridium species]] (negative) from [[Bacillus species]] (positive)
+**Aerotolerant strains of [[Clostridium species]] (negative) from [[Bacillus species]] (positive)
-** Members of the [[Enterobacteriaceae family]] (positive) from other Gram-negative bacilli
+**Members of the [[Enterobacteriaceae]] family (positive) from other Gram-negative bacilli
-* Detects the presence of catalase, which catalyzes the conversion of hydrogen peroxide into water and oxygen
+*Detects the presence of catalase, which catalyzes the conversion of hydrogen peroxide into water and oxygen
-* Mix a small sample of bacteria with 3% hydrogen peroxide
+*Mix a small sample of bacteria with 3% hydrogen peroxide
-** Positive if bubbles appears within 10 seconds
+**Positive if bubbles appears within 10 seconds
-** Negative if no or only a few bubbles
+**Negative if no or only a few bubbles
 [[Category:Diagnostics]]