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Is Streptococcus pneumoniae Gram positive or negative?
Streptococcus pneumoniae (S. pneumoniae) are lancet-shaped, gram-positive, facultative anaerobic bacteria with over 90 known serotypes. Most S. pneumoniae serotypes can cause disease, but only a minority of serotypes produce the majority of pneumococcal infections.
What is the prevalence of Streptococcus pneumoniae?
Streptococcus pneumoniae. Pneumococci are common inhabitants of the respiratory tract and may be isolated from the nasopharynx of 5–90% of healthy persons, depending on the population and setting. Only 5–10% of adults without children are carriers. Among school-aged children, 20–60% may be carriers.
Is Streptococcus pneumoniae extracellular or intracellular?
Is Streptococcus pneumoniae extracellular or intracellular?
S. pneumoniaemay occur intracellularly or extracellularly as gram-positive lanceolate diplococci, but can also occur as single cocci or in short chains of cocci. S. pneumoniaeis a fastidious bacterium, growing best at 35-37°C with ~5% CO 2(or in a candle-jar).
How do you test for Streptococcus pneumoniae?
How do you test for Streptococcus pneumoniae?
S. 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.
How many known serotypes of Streptococcus pneumoniae are there?
There are 100 known serotypes of Streptococcus pneumoniae, the bacteria that cause pneumococcal disease. Streptococcus pneumoniae are lancet-shaped, gram-positive, facultative anaerobic bacteria with 100 known serotypes.
What is the pathophysiology of pneumococcus?
The pneumococcus is a human-specific pathogen which colonizes the nasopharynx and spreads between hosts through aerosol and potentially through the contamination of objects with mucosal secretions if the bacteria is living within a biofilm (1–3). Rates of carriage vary from 5–10% of healthy adults to 20–40% of healthy children.
Is Streptococcus pneumoniae motile or nonmotile?
Is Streptococcus pneumoniae motile or nonmotile?
They are usually found in pairs ( diplococci) and do not form spores and are nonmotile. As a significant human pathogenic bacterium S. pneumoniae was recognized as a major cause of pneumonia in the late 19th century, and is the subject of many humoral immunity studies.
Is pneumococcus dangerous to humans?
Is pneumococcus dangerous to humans?
It is a commensal organism in the human respiratory tract, meaning that it benefits from the human body, without harming it. However, infection by pneumococcus may be dangerous, causing not only pneumonia, but also bronchitis, otitis media, septicemia, and meningitis.