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Introduction of Salmonella Typhi Salmonella Typhi is a member of the family, Enterobacteriaceae and it is a Gram-negative bacillus, non-sporing, non-encapsulated, aerobic, or facultative anaerobe of size 2 to 4 × 0.6 µm that causes enteric fever (typhoid fever) and food poisoning or gastroenteritis. Biochemical …
Introduction of Gram-Negative Bacilli and Coccobacilli Bacteria ‘Gram-Positive Negative (GNB)‘ is also called Gram-Negative Rods (GNR) bacteria which take safranin after decolorization and stain pink or red on Gram’s staining but the shape should be rod ( for Gram-negative bacilli) but the combination of both …
Introduction of Gram-Negative Bacilli (GNB) Bacteria ‘Gram Positive Negative (GNB)‘ is also called Gram Negative Rods (GNR) bacteria which take safranin after decolorization and stain pink or red on Gram’s staining. The most of GNR bacteria are medically important and among them few are Escherichia …
Introduction The genus, Vibrio is a member of the family, Vibrionaceae and the most common human pathogens are Vibrio cholerae, V. parahaemolyticus, and V. vulnificus. Vibrio cholerae is a species of Gram-negative, motile, non-sporing, and non-capsulated, facultative anaerobe and comma-shaped bacterium. It is a ubiquitous …
Introduction of Gram Positive Rods (GPR) ‘Gram Positive Bacilli (GPB)‘ is also called Gram Positive Rods (GPR) bacteria which retain crystal violet dye and stain blue or purple on Gram’s staining. The most common medically important bacteria of GPR are Mycobacterium tuberculosis, Mycobacterium leprae, Listeria monocytogenes, …
Introduction of Hemolysis and Hemodigestion When the pure isolated colony of organism on a blood agar plate is exposed in bright transmitted light, we differentiate between hemolysis and hemodigestion since hemolysis is the process of killing blood cells by bacteria, and the area surrounding a …
Introduction of Proteus mirabilis The genus Proteus was discovered in 1885 by Hauser and it is also named after a Greek god. Proteus is a member of the family, Enterobacteriaceae and it is a Gram-negative, oxidase-negative, fimbriated, motile, non-sporing rod-shaped bacterium without capsule and having a size …
Introduction of Bile Esculin test Bile esculin test is widely used to differentiate Enterococci from streptococci, other than streptococcus bovis as well as Yersinia enterocolitica from food and animal feeding stuff and Listeria monocytogenes which are bile tolerant and can hydrolyze esculin to esculetin, it reacts …