Is Streptococcus pneumoniae rod shaped?
Abstract. Streptococcus pneumoniae is an oval-shaped Gram-positive coccus that lives in intimate association with its human host, both as a commensal and pathogen.
What is the shape and arrangement of Streptococcus pneumoniae?
Streptococcus pneumoniae bacteria are gram-positive cocci arranged in chains and pairs (diplococci) on microscopic examination.
How is Streptococcus pneumoniae diagnosis?
Definitively diagnosing Streptococcus pneumoniae infection generally relies on isolating the organism from blood or other normally sterile body sites. Tests are also available to detect capsular polysaccharide antigen in body fluids.
What is a lancet-shaped bacteria?
Streptococcus pneumoniae are lancet-shaped, gram-positive, facultative anaerobic bacteria with more than 100 known serotypes. Most S. pneumoniae serotypes can cause disease, but only a minority of serotypes produce the majority of pneumococcal infections.
What is the shape of the Streptococcus bacteria?
Streptococci are nonmotile, Gram-positive, nonsporeforming bacteria, that live in pairs or chains of varying length. They are characteristically round or ovoid in shape.
Which organism has Lancet diplococci morphology?
The encapsulated, Gram-positive, coccoid bacteria have a distinctive morphology on Gram stain, lancet-shaped diplococci….
| Streptococcus pneumoniae | |
|---|---|
| Order: | Lactobacillales |
| Family: | Streptococcaceae |
| Genus: | Streptococcus |
| Species: | S. pneumoniae |
What is Streptococcus pneumoniae?
Streptococcus pneumoniae. 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. Pneumococci are common inhabitants…
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.
Is there a Lancefield group antigen for Streptococcus pneumoniae?
Some group antigens are shared by more than one species; no Lancefield group antigen has been identified for S pneumoniaeor for some other α- or γ-streptococci. With advances in serologic methods, other streptococci have been shown to possess several established group antigens. Figure 13-2
What are the virulence factors of Streptococcus pneumoniae?
Polysaccharide capsule : It is the major virulence factor of Streptococcus pneumoniae (antiphagocytic in nature). Antibody to the polysaccharide capsule (>80 serotypes) provides type-specific immunity.
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