What is the shape and arrangement of Streptococcus pneumoniae?
What is the shape and arrangement of Streptococcus pneumoniae?
Streptococcus pneumoniae cells are Gram-positive, lancet-shaped cocci (elongated cocci with a slightly pointed outer curvature). Usually, they are seen as pairs of cocci (diplococci), but they may also occur singly and in short chains.
Is Streptococcus pneumoniae a gram-positive cocci?
Streptococcus pneumoniae are lancet-shaped, gram-positive, facultative anaerobic bacteria with 100 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 of the respiratory tract.
Is Streptococcus pneumoniae a cocci?
S. pneumoniae may occur intracellularly or extracellularly as gram-positive lanceolate diplococci, but can also occur as single cocci or in short chains of cocci. S. pneumoniae is a fastidious bacterium, growing best at 35-37°C with ~5% CO2 (or in a candle-jar).
What is the structure of Streptococcus pneumoniae?
pneumoniae is roughly six layers thick and is composed of peptidoglycan with teichoic acid attached to approximately every third N-acetylmuramic acid. Lipoteichoic acid is chemically identical to the teichoic acid but is attached to the cell membrane by a lipid moiety.
How do I know if I have 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.
What is the difference between pneumonia and streptococcus pneumoniae?
Pneumonia can be caused by a variety of viruses, bacteria, and sometimes fungi. Pneumococcal pneumonia is caused by bacteria called Streptococcus pneumoniae or strep. S. pneumoniae is also called pneumococcus.
What is the treatment for Gram-positive cocci?
Most infections due to Gram-positive organisms can be treated with quite a small number of antibiotics. Penicillin, cloxacillin, and erythromycin should be enough to cover 90 per cent of Gram-positive infections.
What is the difference between pneumonia and Streptococcus pneumoniae?
What are the symptoms of Streptococcus pneumoniae?
Symptoms can include fever, cough, shortness of breath, chest pain, stiff neck, confusion, increased sensitivity to light, joint pain, chills, ear pain, sleeplessness, and irritability. In severe cases, pneumococcal disease can cause hearing loss, brain damage, and death.
Where is Streptococcus pneumoniae found in the body?
Streptococcus pneumoniae is a bacterium commonly found in the nose and throat. The bacterium can sometimes cause severe illness in children, the elderly and other people with weakened immune systems.
How are the cells of Streptococcus pneumoniae arranged?
Arrangement Of Cells – Streptococcus pneumoniae is arranged in pairs (diplococci), with a broad end in apposition and the long axis of the coccus parallel to the line joining the two cocci.
What is the motility of Streptococcus pneumoniae?
Motility – Streptococcus pneumoniae is a Non-motile bacterium. Flagella – Streptococcus pneumoniae is a Non-flagellated bacterium. Spores – Streptococcus pneumoniae is a Non-sporing Bacterium. Capsule – S. pneumoniae is a capsulated bacterium and is present in such a way that a capsule encloses each pair of cocci.
How is a pneumococci different from a viridans streptococci?
Differentiating pneumococci from viridans streptococci is difficult as young pneumococcal colonies appear raised, similar to viridans streptococci. However, once the pneumococcal culture ages 24-48 hours, the colonies become flattened, and the central portion becomes depressed, which does not occur with viridans streptococci ( Figure 2 ).
How is Staphylococcus aureus a Gram + ve bacterium?
Gram Staining Reaction – S. pneumoniae is a Gram +ve bacterium. MORPHOLOGY OF STAPHYLOCOCCUS AUREUS Shape – Round shape (cocci) Size – 1 micron (diameter) Arrangement of cells – Grape-like clusters Motility – Non-motile Flagella – Non-flagellated Spores – Non-sporing Capsule …