What is the shape of Streptococcus spp bacteria?
What is the shape of Streptococcus spp bacteria?
round
Streptococci are nonmotile, Gram-positive, nonsporeforming bacteria, that live in pairs or chains of varying length. They are characteristically round or ovoid in shape.
What is the morphology of Streptococcus and staphylococcus?
Staphylococci and Streptococci are grouped as Gram-positive cocci. Staphylococci form clumps, whereas Streptococci grow in chains. They can be discriminated by catalase test because Staphylococci have the capability to produce catalase [2].
Which morphological property is characteristic of streptococci?
Morphology. Streptococci are coccoid bacterial cells microscopically, and stain purple (Gram-positive) when Gram staining technique is applied. They are nonmotile and non-spore forming. These cocci measure between 0.5 and 2 μm in diameter.
How can you distinguish Staphylococcus spp from Streptococcus spp?
Staphylococcus and Micrococcus spp. are catalase positive, whereas Streptococcus and Enterococcus spp. are catalase negative. If a Gram-positive cocci is catalase positive and presumed to be a staphylococci, the coagulase test is often performed.
What is the morphology of Staphylococcus aureus?
Microscopic morphology. S. aureus cells are Gram-positive and appear in spherical shape. They are often in clusters resembling bunch of grapes when observed under light microscope after Gram staining.
How can you differentiate Staphylococcus and Streptococcus under the microscope?
The main criterion for differentiation between Staphylococcus and Streptococcus genera is the catalase test. Staphylococci are catalase positive whereas Streptococci are Catalase negative. Catalase is an enzyme used by bacteria to induce the reaction of reduction of hydrogen peroxide into water and oxygen.
What characteristics are used to differentiate staphylococci from streptococci?
Positive (Catalase is an enzyme to converts hydrogen peroxide to water and oxygen gas). Staph does not need enriched media (not fastidious). Strep needs enriched media (fastidious). Staphylococci are found on the skin.
How does Streptococcus look under a microscope?
Under a microscope, streptococcus bacteria look like a twisted bunch of round berries. Illnesses caused by streptococcus include strep throat, strep pneumonia, scarlet fever, rheumatic fever (and rheumatic heart valve damage), glomerulonephritis, the skin disorder erysipelas, and PANDAS. Familiarly known as strep.
