API-20E test strip (from bioMerieux, Inc.) is used to identify the enteric gram negative rods.
Certain bacteria produce acetoin as the chief end product of glucose fermentation. Acetoin gets oxidized to diacetyl giving red color.
Common culture media are bismuth sulfite agar, MacConkey agar, deoxycholate citrate agar, xylose lysine deoxycholate agar, salmonella-shigella agar, etc.
Cholera is an acute infection of the gut caused by ingestion of food or water contaminated with the bacterium Vibrio cholerae O1 or O139.
Enterobacteriaceae is a family of gram-negative rods which are catalase positive and oxidase negative.
Gram positive bacteria appear purple and gram-negative bacteria appear pink when stained by Gram-staining methods.
IMViC is an acronym that stands for four different tests; indole test, methyl red test, Voges-Proskauer test, and citrate utilization test.
The most common cause of gastroenteritis worldwide, Campylobacter is a curved, gram-negative rod. It is an oxidase-positive microaerophile.
Bacteria exist in four basic morphologies: cocci; rod-shaped cells, or bacilli; spiral-shaped cells, or spirilla; and comma-shaped cells, or vibrios.
Lipopolysaccharide (LPS) layer also called the outer membrane is the outermost layer present in the cell wall of gram-negative bacteria.