The Biochemical Tests And Results For Identifying Streptococcus agalactiae

When you are testing for the presence of a specific species of bacteria in the world of microbiology, the most reliable way is by identifying the key details that separate it from other species that may also be present in a sample.

The Biochemical Tests And Results For Identifying Streptococcus Agalactiae

For these reasons, scientists have created an extensive list of tests that are used in laboratory settings across the world that bacteria will react to.

In this short piece, we are going to explain some of the results that can indicate the presence of the bacteria Streptococcus agalactiae in a sample, a bacterium that usually exists harmlessly in people’s guts, but can cause major infection in the elderly, newborns, and immunocompromised people.


The CAMP test, also known as the Christie-Atkins-Much-Peterson test, is a microbiological test that is used to identify streptococci species that can be identified as group B or Beta.

Putting a sample of Streptococcus agalactiae in a Petri plate that has been prepared for a CAMP test will result in a line of lighter coloration compared to the deep blood-red of the rest of the agar, and is considered a positive result.

Catalase Test

This test detects the presence of the enzyme catalase, which is used by an organism to break down the generally harmful hydrogen peroxide into safer water and oxygen.

If an organism that is put through this test can generate catalase, the sample will create a positive result, which can be observed through the presence of oxygen bubbles forming in the sample.

In this test, Streptococcus agalactiae will create a positive result.

Capsule Test

This test is a basic staining test that can help a researcher differentiate between the capsule, an outer layer of a bacterium that is gelatinous, from the bacterium itself. 

Ina positive result of this test, the dye that is applied to the cell wall of the bacteria that is being tested will result in the cell walls turning a violet or blue color, which this species of Streptococcus will.

Gram Staining

Positive results from this test result in the bacteria being studied turning a strong violet color to differentiate from negative results. In this case, Streptococcus will give a positive result.


These are just a few of the tests that can be done to determine the bacteria you are studying.

Jennifer Dawkins

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