Pneumococcal [noo-muh-KOK-uhl] disease is a name for any infection caused by bacteria called Streptococcus pneumoniae, or pneumococcus. Pneumococcal infections can range from ear and sinus infections to pneumonia and bloodstream infections.
What causes pneumococcus?
Streptococcus pneumoniae (pneumococcus) can cause a range of different illnesses including sinusitis, otitis media, pneumonia, bacteraemia, osteomyelitis, septic arthritis and meningitis. Vaccines are available that help prevent invasive pneumococcal disease (such as bacteraemia and meningitis).
How many types of pneumococcus are there?
About pneumococcal infections There are more than 90 different strains of Streptococcus pneumoniae (S. pneumoniae) bacteria (known as serotypes), some of which cause more serious infection than others.
What are the characteristics of pneumococcus train?
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.
Which species of pneumococcus bacteria forms rough colonies?
A third strain which we have designated as “R-III” was isolated from a strain of Type III pneumococci which invariably produced rough colonies when plated upon acid media. These strains were kept in a similar manner on rabbit blood agar.
What does Streptococcus pyogenes cause?
Life-threatening infections caused by Streptococcus pyogenes (group A streptococcus) include scarlet fever, bacteremia, pneumonia, necrotizing fasciitis, myonecrosis and Streptococcal Toxic Shock Syndrome (StrepTSS).
Which species of pneumococcus bacteria found poisonous?
Streptococcus pneumoniae is the main cause of community acquired pneumonia and meningitis in children and the elderly, and of sepsis in those infected with HIV….
| Streptococcus pneumoniae | |
|---|---|
| Genus: | Streptococcus |
| Species: | S. pneumoniae |
| Binomial name | |
| Streptococcus pneumoniae (Klein 1884) Chester 1901 |
What is the morphology of Streptococcus pyogenes?
Streptococcus pyogenes is a Gram-positive, spherical, and facultative anaerobic bacterium. Similar in cellular morphology to Staphylococcus species, this species of bacteria grows in long chains versus the grape-like clusters observed as Staphylococcus.
What is the function of Pneumolysin?
Pneumolysin is a cholesterol-dependent cytolysin (CDC) toxin that forms lytic pores in host membranes and mediates pneumococcal disease pathogenesis by modulating inflammatory responses.
What is the shape of pneumococcus?
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.
What are the symptoms of a bacterial throat infection?
Symptoms of bacterial pharyngitis may include :
- significant pain when swallowing.
- tender, swollen neck lymph nodes.
- visible white patches or pus on the back of the throat.
- tonsils that are swollen and red.
- a headache.
- abdominal pain.
- fatigue.
- nausea.
What is the shape and size of Streptococcus pneumoniae?
Shape – Streptococcus pneumoniae is an elongated round shape (coccus) bacterium with one end broad or rounded and the other end is pointed (flame shape or lanceolate appearance). Size – The size of Streptococcus pneumoniae is about 1 mm (micrometer).
What do we know about the pneumococcus?
The pneumococcus is the classic Gram-positive extracellular pathogen. The medical burden of diseases it causes is amongst the greatest in the world. Intense study for more than 100 years has yielded an understanding of fundamental aspects of its physiology, pathogenesis, and immunity.
Is Streptococcus pneumoniae Gram positive or negative?
Streptococcus pneumoniae, or pneumococcus, is a Gram-positive, alpha-hemolytic (under aerobic conditions) or beta-hemolytic (under anaerobic conditions), facultative anaerobic member of the genus Streptococcus.
What are the culture requirements of Streptococcus pneumoniae?
CULTURE REQUIREMENTS OF STREPTOCOCCUS PNEUMONIAE (PNEUMOCOCCUS) ⇒ Special requirements – Pneumococci or Streptococcus pneumoniae have complex nutritional requirements and readily grows in a media containing Blood, Serum or Sugars, commonly Blood Agar medium is used for the cultivation of Streptococcus pneumoniae.
