Catalase test: Difference between revisions
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**Positive if bubbles appears within 10 seconds |
**Positive if bubbles appears within 10 seconds |
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**Negative if no or only a few bubbles |
**Negative if no or only a few bubbles |
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== Organisms == |
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=== Catalase-Positive === |
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{{#ask: |
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[[Category:Bacteria]] |
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[[Catalase test::Catalase-positive]] |
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=== Catalase-Negative === |
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{{#ask: |
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[[Category:Bacteria]] |
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[[Catalase test::Catalase-negative]] |
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[[Category:Diagnostics]] |
[[Category:Diagnostics]] |
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Revision as of 00:53, 5 August 2020
- Used to differentiate a number of bacteria:
- Staphylococcus species (positive) from Streptococcus species and Enterococcus species (negative)
- Bacillus species (positive) from aerotolerant strains of Clostridium species (negative)
- 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
