What is the morphology of Shigella?
Shigella species are small Gram negative rods, 0.3 – 1µm in diameter and 1 – 6µm in length, appearing singly, in pairs and in chains. Shigella species are facultative anaerobes and are non-spore formers.
What is the shape of Shigella Sonnei?
Shigella sonnei is a rod-shaped, Gram-negative facultative intracellular pathogen. It was named ‘Sonne’s bacillus’ after Carl Olaf Sonne who described it as a causative agent of bacillary dysentery.
What does Shigella Sonnei look like?
Shigella sonnei is a species of Shigella. Together with Shigella flexneri, it is responsible for 90% of shigellosis cases. Shigella sonnei is named for the Danish bacteriologist Carl Olaf Sonne. It is a Gram-negative, rod-shaped, nonmotile, non-spore-forming bacterium.
Which is a characteristic of Shigella bacteria?
CHARACTERISTICS: Shigella spp., of the Enterobacteriaceae family, are gram-negative rod-shaped pathogenic bacteria (1). They are non-motile, non-encapsulated, and facultative anaerobes that do not ferment lactose, or do so slowly.
Where is shigella Sonnei found?
boydii occur in Central and South America than elsewhere. Shigella sonnei has been implicated in more foodborne outbreaks in developed countries than any other species. Outbreaks have been most often associated with food, water, and child care centers.
Is Shigella Sonnei a lactose fermenter?
Shigella sonnei is a rod-shape bacterium and is lactose-fermenting bacterium causing dysentery (4).
Is Shigella a gram-negative bacilli?
Shigellae are Gram-negative, nonmotile, facultatively anaerobic, non-spore-forming rods. Shigella are differentiated from the closely related Escherichia coli on the basis of pathogenicity, physiology (failure to ferment lactose or decarboxylate lysine) and serology.
Where is shigella Sonnei normally found?
What does Shigella Sonnei cause?
Shigella bacteria cause an infection called shigellosis. Most people with Shigella infection have diarrhea (sometimes bloody), fever, and stomach cramps. Symptoms usually begin 1–2 days after infection and last 7 days.
Is Shigella a bacillus?
Shigella is a nonmotile gram-negative bacillus that does not ferment lactose. It grows readily on standard media and can be easily isolated using selective media. It is a member of the Enterobacteriaceae family and is closely related to E. coli.
How do you identify Shigella?
Infection is diagnosed when a laboratory identifies Shigella in the stool (poop) of an ill person. The test could be a culture that isolates the bacteria or a rapid diagnostic test that detects genetic material of the bacteria.
What causes shigella Sonnei?
Getting Shigella on your hands and touching your mouth. Shigella can get on your hands by: Touching surfaces, such as toys, bathroom fixtures, changing tables, and diaper pails contaminated with Shigella bacteria from someone with an infection.