What is the colony morphology of Staphylococcus?

What is the colony morphology of Staphylococcus?

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 morphology does Staphylococcus aureus shows?

Microscopic morphology. S. aureus cells are Gram-positive and appear in spherical shape. They are often in clusters resembling bunch of grapes when observed under light microscope after Gram staining.

How do you identify Staphylococcus epidermidis?

Identification. The normal practice of detecting S. epidermidis is by using appearance of colonies on selective media, bacterial morphology by light microscopy, catalase and slide coagulase testing. On the Baird-Parker agar with egg yolk supplement, colonies appear small and black.

What are the identifying characteristics of Staphylococcus aureus?

S. aureus was identified according to the phonotypical characteristics of being large, creamy, and forcefully hemolytic on TSA with 5% sheep blood. Potential SCVs colonies of tiny, nonpigmented, and nonhemolytic colonies on TSA with 5% sheep blood were also collected [4, 5].

Where is Staphylococcus found?

Staphylococcus aureus or “staph” is a type of bacteria found on human skin, in the nose, armpit, groin, and other areas. While these germs don’t always cause harm, they can make you sick under the right circumstances.

Where is Staphylococcus aureus found?

Staphylococcus aureus or “staph” is a type of bacteria found on human skin, in the nose, armpit, groin, and other areas.

What disease is caused by Staphylococcus epidermidis?

Staphylococcus epidermidis can cause wound infections, boils, sinus infections, endocarditis and other inflammations.

Is Staphylococcus epidermidis good or bad?

S. epidermidis mainly colonizes human skin and is a health concern due to its involvement in hospital-acquired infections. The organisms are frequently detected in saliva and dental plaque and are thought to be associated with periodontitis, acute and chronic pulpitis, pericoronitis, dry socket, and angular stomatitis.

Is Staphylococcus gram positive or negative?

Staphylococcus aureus is a gram-positive, catalase-positive, coagulase-positive cocci in clusters. S. aureus can cause inflammatory diseases, including skin infections, pneumonia, endocarditis, septic arthritis, osteomyelitis, and abscesses.

Can I get pregnant with staphylococcus?

Some studies have suggested that a Staph infection might affect sperm and fertility. In general, exposures that fathers or sperm donors have are unlikely to increase the risk to a pregnancy.

How big are the colonies of Staphylococcus aureus?

S. aureus colonies are about 1-2 mm in size and yellow to golden in color. A zone of complete hemolysis can usually be seen when cultured on blood agar. S. epidermidis colonies are white and usually do not produce hemolysis. Catalase: converts H₂O₂ to H₂O and O₂.

What are the cultural characteristics of Staphylococcus saprophyticus?

Staphylococcus saprophyticus; MORPHOLOGY. They are Gram-positive cocci, 0.5-1 µm in diameter, arranged in irregular clusters, singly or in pairs. CULTURAL CHARACTERISTICS. They are facultative anaerobes but grow best in aerobic environment at 35ᵒC – 37ᵒC on blood agar and mannitol salt agar as a selective medium. This selective medium is

What is the macroscopic appearance of Staphylococcus aureus?

MACROSCOPIC APPEARANCE. Some unusual strains produce dwarf colonies. Most colonies appear relatively smooth, glossy, butyrous, and sometimes appearing wet. Colonies of most strains are usually opaque and may be pigmented white or cream and sometimes yellow to orange.

How are Staphylococcus aureus resistant to methicillin?

Methicillin-resistant strains of Staphylococcus aureus (i.e. MRSA) often have only weak or no beta-hemolysis and special cultivation media with oxacillin, mannitol and NaCl for their isolation are used. MRSA is able to grow on this media and produce colonies of certain color, depending on used pH indicator (in this picture pink).