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Tag: Gram Positive Cocci

link to Optochin Sensitivity Test: Principle, Procedure, Results

Optochin Sensitivity Test: Principle, Procedure, Results

Streptococcus pneumoniae strains are sensitive to the chemical optochin (ethylhydrocupreine hydrochloride). Optochin sensitivity allows for the presumptive identification of alpha-hemolytic...

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link to Bile Solubility Test: Principle, Procedure, Results

Bile Solubility Test: Principle, Procedure, Results

The bile (sodium deoxycholate) solubility test distinguishes Streptococcus pneumoniae from all other alpha-hemolytic streptococci.  Streptococcus pneumoniae is bile soluble, whereas all other...

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link to Bacitracin Test: Principle, Procedure, Results

Bacitracin Test: Principle, Procedure, Results

Bacitracin is a bactericidal drug that is useful in treating superficial skin infections but is too toxic for systemic use. Bacitracin is a polypeptide antibiotic produced by Bacillus subtilis....

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link to Streptococcus pneumoniae: Properties, Pathogenesis, and Diagnosis

Streptococcus pneumoniae: Properties, Pathogenesis, and Diagnosis

Streptococcus pneumoniae (pneumococci) is a part of the normal nasopharyngeal and oropharyngeal flora. It is an important etiological agent of upper and lower respiratory tract infections (URTI...

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link to Biochemical Tests for Bacterial Identification

Biochemical Tests for Bacterial Identification

In this blog post, I am sharing information about the standard, conventional biochemical tests and their primary uses in the Microbiology laboratory for identifying pathogens of interest. Some of the...

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link to Shapes of Bacteria: Cocci, Bacilli, and Spirochetes

Shapes of Bacteria: Cocci, Bacilli, and Spirochetes

The shape of a bacterium is determined by its rigid cell wall. Bacteria that lack a cell wall (Mycoplasma and L-forms) display a great diversity of unusual shapes. Bacteria having various shapes are...

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