What is the morphology of Vibrio cholerae?
V cholerae is a comma-shaped, gram-negative aerobic or facultatively anaerobic bacillus that varies in size from 1-3 µm in length by 0.5-0.8 µm in diameter (see the image below). Its antigenic structure consists of a flagellar H antigen and a somatic O antigen.
What is the arrangement of Vibrio cholerae?
cholerae is described as a ‘comma-shaped’ bacterium. Unlike Escherichia coli and other bacilli, where the rod-shaped cell is described as a regular cylinder capped by two hemispheres, the V. cholera cell consists of a bent tubular shape capped by hemispheres.
What does Vibrio cholerae produce?
During infection, V. cholerae secretes cholera toxin (CT), a protein that causes profuse, watery diarrhea (known as “rice-water stool”). This cholera toxin contains 5 B subunits that plays a role in attaching to the intestinal epithelial cells and 1 A subunit that plays a role in toxin activity.
What is Vibrio cholerae serogroup O1?
Two serogroups (O1 and O139) or types of Vibrio cholerae bacteria can produce cholera toxin that causes the disease we call cholera. About 1 in 10 people infected with cholera toxin-producing O1 or O139 Vibrio cholerae experience severe, life-threatening illness, and both serogroups can cause widespread epidemics.
What is the economic importance of Vibrio cholerae?
It is a facultative human pathogen found in coastal waters that causes the acute gastrointestinal disease, cholera, a major health threat in poor nations. It is widely acknowledged as one of the most important water borne pathogen of worldwide economic significance.
What is the shape and arrangement of E coli?
E. coli is a gram-negative (-ve) bacteria. These are straight, rod shaped (bacillus) bacterium. They are arranged singly or in pairs. Their size is about 1–3 µm × 0.4–0.7 µm (micrometer).
What is bacterial arrangement?
In fact, structure of bacteria has two aspects, arrangement and shape. So far as the arrangement is concerned, it may Paired (diplo), Grape-like clusters (staphylo) or Chains (strepto). In shape they may principally be Rods (bacilli), Spheres (cocci), and Spirals (spirillum).
What type of pathogen is Vibrio?
Vibrio is a genus of Gram-negative bacteria, possessing a curved-rod (comma) shape, several species of which can cause foodborne infection, usually associated with eating undercooked seafood. Typically found in salt water, Vibrio species are facultative anaerobes that test positive for oxidase and do not form spores.
Which is the main cause of cholera Mcq?
Cholera is a diarrhoeal disease caused by a bacterium called Vibrio cholerae.