What antigens are present in Vibrio cholera?
cholerae O139 O antigen consists of a single oligosaccharide unit that is identical to the repeating unit of the capsule (8). Thus, both the O antigen and capsule are composed of O-antigen polysaccharide.
What is the cell morphology of Vibrio cholerae?
Vibrio cholerae, the pathogenic bacterium responsible for the diarrheal disease cholera, adopts a characteristic “comma”-shaped cell morphology.
What is the morphology of vibrio?
Vibrios are microbiologically characterized as gram-negative, highly motile, facultative anaerobes (not requiring oxygen), with one to three whiplike flagella at one end. Their cells are curved rods 0.5 μm (micrometre; 1 μm = 10-6 metre) across and 1.5 to 3.0 μm long, single or strung together in S-shapes or spirals.
What morphology is the bacteria that causes cholera?
Cholera is an acute secretory diarrheal illness caused by the toxins of the comma-shaped gram-negative Vibrio cholerae bacterium that is known worldwide for its pandemic potential.
What is an O1 antigen?
The O1 antigen is a constituent of the lipopolysaccharide portion of the outer membrane, and its location on the bacterial surface makes it a major target of both the immune system and bacteriophages.
Is cholera an antigen?
The cholera group has a common antigen, A, and the serotypes are differentiated by the type-specific antigens, B (Ogawa) and C (Inaba). An additional serotype, Hikojima, which has both specific antigens, is rare.
What is the shape of bacillus of Vibrio?
Due to the presence of a rigid cell wall, bacteria maintain a definite shape, though they vary as shape, size and structure. When viewed under light microscope, most bacteria appear in variations of three major shapes: the rod (bacillus), the sphere (coccus) and the spiral type (vibrio).
What antigens does V cholerae have and is this pathogen divided into Serovars?
Is H antigen important in serotyping Vibrio?
Cross-absorption analysis indicated that the H antigens of vibrios were characteristic and homogenous within the species, and therefore a potentially important taxonomic criterion of Vibrio species.
What is the Gram reaction and morphology of Helicobacter pylori?
Helicobacter pylori is a Gram-negative, microaerophilic bacterium colonising the gastric mucosa. Normally, this bacterium has a spiral shape, which is crucial for proper colonisation of the stomach and cork-screwing penetration of dense mucin covering this organ.
What is cholera bacillus?
Pacini, 1854. Vibrio cholerae is a species of Gram-negative, facultative anaerobe and comma-shaped bacteria. The bacteria naturally live in brackish or saltwater where they attach themselves easily to the chitin-containing shells of crabs, shrimps, and other shellfish. Some strains of V.
Is Vibrio Gram-negative?
Vibrio are gram-negative bacteria that are naturally found in warm, salty marine environments, such as salt water and brackish water. More than 20 Vibrio species can cause the human illness vibriosis.
Is vibro cholerae a pathogen?
0 Epidemiology of the Disease and Pathogen (s) Epidemiologically,cholera is described as a disease that has its tendency to cause explosive outbreaks and its potential to cause pandemics.
What is the morphology of cholera?
1. Morphology and Staining of Vibrio Cholera : Vibrio cholera are short, curved, comma shaped gram-negative bacilli which can be readily stained by aniline dyes. They measure about 1.5 µ 0.2-0.4 µ in size, have rounded or slightly pointed ends. On subculture, the comma shape is lost.
What is the structure of cholera?
It is a short, gram-negative, rod-shaped bacterium that appears curved when isolated. There are more than 200 different serogroups of V. cholerae, which are distinguished based on the structure of a protein called the O antigen in the bacterium’s cell wall.
What are some examples of Vibrio bacteria?
In fact, it is a rather small genus, and has way fewer members than, say, the Bacillus genus. The best example of a Vibrio is going to be Vibrio cholerae. Not only is this microbe the causative agent of cholera, but it was also one of the earliest microorganisms to be definitively tied to a specific disease.