What are the characteristics of Staphylococcus?
Characteristics. Staphylococci are Gram-positive, nonspore forming, facultatively anaerobic, nonmotile, catalase-positive or negative, small, spherical bacteria from pairs to, grape-like clusters, from where the name Staphylococcus comes from (staphyle, meaning a bunch of grapes, and kokkos, meaning berry).
What is the shape and morphology of a Staphylococcus bacteria?
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. The name ‘Staphylococcus’ was derived from Greek, meaning bunch of grapes ( staphyle ) and berry ( kokkos ) [1].
How can you differentiate between Staphylococcus aureus and Staphylococcus epidermidis?
Staphylococcus aureus forms a fairly large yellow colony on rich medium; S. epidermidis has a relatively small white colony. S. aureus is often hemolytic on blood agar; S.
What is the morphology of Staphylococcus?
MICROSCOPIC APPEARANCE
| Gram Stain: | Positive. |
|---|---|
| Morphology: | Spherical cocci; often forming regular and “grape-like” clusters. They occur singly, in pairs, tetrads, and short chains. |
| Size: | 0.5 by 1.5 micrometers. |
| Motility: | Non-motile. |
| Capsules: | Usually encapsulated, however, limited capsule formation has been noted on some species. |
What is another name for Staphylococcus?
Methicillin-resistant Staphylococcus aureus (commonly known as MRSA) is a subset of bacterial (staph) infection of the skin. “Staph” is the common name for the bacteria named, Staphylococcus aureus.
How do you test for Staphylococcus?
Most often, doctors diagnose staph infections by checking a tissue sample or nasal secretions for signs of the bacteria. Other tests. If you’re diagnosed with a staph infection, your doctor may order an imaging test called an echocardiogram to check if the infection has affected your heart.
What is the colony morphology of Staphylococcus epidermidis?
S. epidermidis is a very hardy microorganism, consisting of non-motile, Gram-positive cocci, arranged in grape- like clusters. It forms white, raised, cohesive colonies about 1–2 mm in diameter after overnight incubation, and is not haemolytic on blood agar.
What is the morphology of Escherichia coli?
E. 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.
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.
How can you tell the difference between Staphylococcus?
The major test reaction to use in Staphylococcus identification is the coagulase test reaction, which divides the genus Staphylococcus into 2 groups—coagulase negative species and coagulase positive species.
What is the best treatment for Staphylococcus?
Antibiotics commonly prescribed to treat staph infections include certain cephalosporins such as cefazolin; nafcillin or oxacillin; vancomycin; daptomycin (Cubicin); telavancin (Vibativ); or linezolid (Zyvox).
What are the symptoms of Staphylococcus in a woman?
The most common type of staph infection is the boil, a pocket of pus that develops in a hair follicle or oil gland. The skin over the infected area usually becomes red and swollen. If a boil breaks open, it will probably drain pus. Boils occur most often under the arms or around the groin or buttocks.
What is the morphology of the Staphylococcus epidermidis?
Coccus is the morphological description used to describe the spherical shape of Staphylococcus epidermidis, explains the National Center for Biotechnology Information. Bacterial morphology is used to designate the shape of bacteria, according to the American Society for Microbiology.
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.
Who is at risk for Staphylococcus epidermidis infection?
Although S. epidermidis is not usually pathogenic, patients with compromised immune systems are at risk of developing infection. These infections are generally hospital-acquired. S. epidermidis is a particular concern for people with catheters or other surgical implants because it is known to form biofilms that grow on these devices.
How did Rosenbach distinguish S.epidermidis from aureus?
Friedrich Julius Rosenbach distinguished S. epidermidis from S. aureus in 1884, initially naming S. epidermidis as S. albus. He chose aureus and albus since the bacteria formed yellow and white colonies, respectively.
