Culture Media

Salmonella-Shigella (SS) Agar

Last updated on June 21st, 2021Salmonella-Shigella (SS) agar is used for selective isolation and differentiation of Salmonella and Shigella. It is used for the isolation, cultivation and differentiation of gram-negative enteric microorganisms from both clinical […]

Biochemical Tests

Voges Proskauer (VP) Test

Last updated on June 21st, 2021The Voges-Proskauer (VP) test is used to determine if an organism produces acetylmethylcarbinol from glucose fermentation. Voges-Proskauer is a double eponym, named after two microbiologists working at the beginning of […]


Vibrio Cholerae: Lab Diagnosis

Last updated on June 17th, 2021 Sample: Fresh diarrheal stool or stool collected in Cary Blair transport medium. Macroscopic examination: Rice watery stool with mucus flecks  The laboratory diagnosis of cholera is based on colony […]


Lipopolysaccharide (LPS) Layer

Last updated on June 18th, 2021Lipopolysaccharide (LPS) layer also called the outer membrane is the outermost layer present only in the cell wall of gram-negative bacteria.  Braun’s lipoprotein tightly links this outer membrane of the […]