What is the morphology 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.

What morphology is Streptococcus?

Morphology. Streptococci are coccoid bacterial cells microscopically, and stain purple (Gram-positive) when Gram staining technique is applied. They are nonmotile and non-spore forming. These cocci measure between 0.5 and 2 μm in diameter.

Is Streptococcus pneumoniae rod shaped?

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 morphology of a streptococcus bacteria?

Streptococcus pyogenes (Group A streptococcus) is a Gram-positive, nonmotile, nonsporeforming coccus that occurs in chains or in pairs of cells. Individual cells are round-to-ovoid cocci, 0.6-1.0 micrometer in diameter (Figure 1).

What shape is pneumonia bacteria?

pneumonia is a lancet-shaped, gram-positive, facultative anaerobic organism that typically occurs in pairs or short chains.

What is E coli morphology?

Type and morphology E. coli is a Gram-negative, facultative anaerobe, nonsporulating coliform bacterium. Cells are typically rod-shaped, and are about 2.0 μm long and 0.25–1.0 μm in diameter, with a cell volume of 0.6–0.7 μm3. Antibiotics can effectively treat E.

What is the colony morphology of Streptococcus pyogenes?

pyogenes colonies after 24 hours of incubation at 35-37°C is dome-shaped with a smooth or moist surface and clear margins. They display a white-greyish color and have a diameter of > 0.5 mm, and are surrounded by a zone of β-hemolysis that is often two to four times as large as the colony diameter.

What is cell morphology and arrangement?

Morphology. … While arrangement refers to the groupings of individual cells, morphology describes the appearance of groups of bacteria, or colonies. Colony shapes can be round, irregular, filamentous or curled. Colonies might be flat or have a rounded elevation.

What is the morphology of Bacillus?

Bacillus species are rod-shaped, endospore-forming aerobic or facultatively anaerobic, Gram-positive bacteria; in some species cultures may turn Gram-negative with age.

What are the characteristics of Streptococcus pneumoniae?

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.

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What is the color of Streptococcus pneumoniae?

pneumoniae appear as small, grey, moist (sometimes mucoidal), colonies and characteristically produce a zone of alpha-hemolysis (green) (Figure 1).

What Gram stain is Streptococcus?

Streptococci are Gram-positive, nonmotile, nonsporeforming, catalase-negative cocci that occur in pairs or chains. Older cultures may lose their Gram-positive character.

What color is Streptococcus?

As cellular division of Streptococcus spp. occurs along a single axis or plane, these bacteria grow in pairs or chains. After 18–24 h of incubation at 35–37 °C on blood agar, typically grayish-white, smooth, glossy, and translucent colonies appear with zones of α/β-hemolysis or no hemolysis.

Is strep pneumonia group A or B?

Group B (GBS) streptococcal pneumonia is the most common type of pneumonia in neonates. The infection is acquired during birth, and at least 25% of women in labor are colonized by the organism. Premature infants are more commonly infected than are term infants.

Is Streptococcus pneumoniae archaebacteria or eubacteria?

Streptococcus pneumoniae, abbreviated to S. pneumoniae is another common eubacteria. It belongs to the Firmicutes phylum. It has a spherical shape and is Gram-positive.

What does Streptococcus pneumoniae look like under a microscope?

Streptococcus pneumoniae bacteria are gram-positive cocci arranged in chains and pairs (diplococci) on microscopic examination. A green, α-hemolytic, zone surrounds S. pneumoniae colonies on blood-agar plates.

How do you identify Streptococcus?

Streptococci are non-motile, microaerophilic, Grampositive spherical bacteria (cocci). They often occur as chains or pairs and are facultative or strict anaerobes. Streptococci give a negative catalase test, while staphylococci are catalase-positive.

What is the morphology of Streptococcus agalactiae?

Streptococcus agalactiae is a gram-positive coccus that, when cultured on sheep blood agar, forms glistening gray-white colonies with a narrow zone of β hemolysis.

What is the colony morphology of Staphylococcus aureus?

S. aureus – individual colonies on agar are round, convex, and 1-4 mm in diameter with a sharp border. On blood agar plates, colonies of Staphylococcus aureus are frequently surrounded by zones of clear beta-hemolysis.

What is the cell morphology?

Cell morphology describes the shape, structure, form, and size of cells. … Studies show that cells isolated from multicellular structures (tissues, organs) and cultured as monolayers, change their morphology from e.g. spherical to spindle-like, elongated shapes.

What is colony morphology used for?

Colony morphology is the visual culture characteristics of a bacterial colony on an agar plate. Observing colony morphology is an important skill used in the microbiology laboratory to identify microorganisms.

What is the morphology of gram negative bacteria?

Gram-negative bacteria have a characteristic cell envelope structure very different from Gram-positive bacteria. Gram-negative bacteria have a cytoplasmic membrane, a thin peptidoglycan layer, and an outer membrane containing lipopolysaccharide.

What is the morphology of Clostridium?

Gram Stain:They usually stain gram-positive, at least in very early stages of growth.Morphology:Cells of most strains occur as straight or slightly curved rods.Size:0.3-2.0 micrometers by 1.5-20.0 micrometers in length.Motility:Motility occurs by peritrichous flagella.Capsules:None.

What kind of bacteria is Spirilla?

A spirillum (plural spirilla) is a rigid spiral bacterium that is Gram-negative and frequently has external amphitrichous or lophotrichous flagella. Examples include: Members of the genus Spirillum. Campylobacter species, such as Campylobacter jejuni, a foodborne pathogen that causes campylobacteriosis.

What is the morphology and arrangement of E coli?

coli is gram-negative (-ve) rod-shaped bacteria. It is 1-3 x 0.4-0.7 µm in size and 0.6 to 0.7 µm in volume. It is arranged singly or in pairs. It is motile due to peritrichous flagella.

How is cell morphology determined?

It employs microscopy to identify the shape, structure, form, color, texture, pattern, and size of the cell(s). In bacteriology, for instance, cell morphology pertains to the shape of bacteria if cocci, bacilli, spiral, etc., and the size of bacteria.

What are examples of morphology?

Other examples include table, kind, and jump. Another type is function morphemes, which indicate relationships within a language. Conjunctions, pronouns, demonstratives, articles, and prepositions are all function morphemes. Examples include and, those, an, and through.

What is normal cell morphology?

Normal CellCancer CellNucleusSpheroid shape, single nucleusIrregular shape, multi-nucleation common

Does Streptococcus pneumoniae have DNA?

Genetics. The genome of S. pneumoniae is a closed, circular DNA structure that contains between 2.0 and 2.1 million base pairs depending on the strain. It has a core set of 1553 genes, plus 154 genes in its virulome, which contribute to virulence and 176 genes that maintain a noninvasive phenotype.

What is the epidemiology of Streptococcus pneumoniae?

Streptococcus pneumoniae is a frequent colonizer of the human nasopharynx with a colonization rate of 27–65% in children (Weiser et al., 2018), whilst the cause of both invasive pneumococcal disease (including bacteremia, meningitis, etc.)

What is the gram reaction of Streptococcus pneumoniae?

Streptococcus pneumoniae is a gram-positive, catalase-negative, facultatively anaerobic organism that grows as a single coccus, as diplococci often identifiable because of their lancet shape, and in chains of variable length. Growth is enhanced in 5% carbon dioxide or anaerobic conditions.