Does Streptococcus pneumoniae ferment inulin?
The organisms are soluble in bile or bile salts. In tissues or pus, the pneumococcus is usually oval or lanceolate in shape, and arranged in pairs with the broad ends opposed. Growth is best on media enriched with blood or serum and differs from other streptococci in fermenting inulin. It has no proteolytic activity.
Does Streptococcus pneumoniae ferment lactose?
Streptococcus pneumoniae is limited in its sugar fermentation ability, being able to use fructose, galactose, sucrose, glucose, raffinose, lactose, inulin, threhalose, and maltose as sources of energy (Holt et al. 1994).
What test can be used to identify Streptococcus pneumoniae?
pneumoniae can be identified using Gram stain, catalase, and optochin tests simultaneously, with bile solubility as a confirmatory test. If these tests indicate that the isolate is S. pneumoniae, serological tests to identify the serotype can be performed.
Is Streptococcus pneumoniae lactose positive or negative?
Biochemical Test and Identification of Streptococcus pneumoniae
| Basic Characteristics | Properties (Streptococcus pneumoniae) |
|---|---|
| Hippurate | Negative (-ve) |
| Inulin | Positive (+ve) |
| Lactose | Positive (+ve) |
| Maltose | Positive (+ve) |
What is inulin fermentation?
Inulin fermentation in the gut leads to the production of beneficial metabolites. • The fermentation model was combined with pig intestinal epithelial cells (IPEC-J2). • Inulin was associated with elevated butyrate levels.
Does Streptococcus pneumoniae grow on MacConkey Agar?
Hence, it does not grow on MacConkey agar (MA) due to the absence of blood as well as due to the presence of high concentration of bile in the medium which is inhibitory to the growth of S. pneumoniae.
How does Streptococcus pneumoniae metabolize?
Streptococcus pneumoniae is a strictly fermentative human pathogen that relies on carbohydrate metabolism to generate energy for growth. The nasopharynx colonized by the bacterium is poor in free sugars, but mucosa lining glycans can provide a source of sugar.
Is Streptococcus pneumoniae catalase positive?
Streptococcus pneumoniae is a gram-positive, α-hemolytic, lancet-shaped diplococcus and is bile soluble and optochin sensitive. Streptococcus pneumoniae is catalase-negative but produces hydrogen peroxide.
How is Streptococcus diagnosed?
There are two types of tests for strep throat: a rapid strep test and throat culture. A rapid strep test involves swabbing the throat and running a test on the swab. The test quickly shows if group A strep is causing the illness. If the test is positive, doctors can prescribe antibiotics.
Does Streptococcus pneumoniae grow on MacConkey?
Is Streptococcus catalase positive or negative?
Gram-positive cocci include Staphylococcus (catalase-positive), which grows clusters, and Streptococcus (catalase-negative), which grows in chains.