Gram-positive cocci: Spherical bacteria that retain the crystal violet stain during Gram staining, indicating a thick peptidoglycan cell wall. AUTHOR (date): "Gram-positive cocci."
Irregular clusters arrangement: The typical grouping of staphylococci where spherical cells form non-uniform, grape-like clusters rather than orderly chains or pairs.
Capsule presence: Some staphylococci may produce a capsule, a slimy layer surrounding the cell that can aid in evading host defenses.
Lack of spores and flagella: Staphylococci do not form spores or possess flagella, meaning they do not have structures for dormancy or motility.
Facultative anaerobe: These bacteria can grow in the presence or absence of oxygen, adapting to different environmental conditions.
Salt and pH tolerance: Staphylococci can withstand high salt concentrations and extremes in pH, contributing to their survival on human skin and surfaces.
1. How do the arrangement and the Gram-positive nature of staphylococci compare to other Gram-positive cocci like streptococci?
2. What is a consequence of the coagulase enzyme produced by Staphylococcus aureus?
3. What is the primary role of the high carriage rate of S. aureus among healthy individuals in its epidemiology?
Characteristics of Staphylococci
Gram-positive cocci in irregular clusters.
Virulence factor — coagulase?
Enzyme that coagulates blood plasma.
Epidemiology — carriage rate?
20-60% of healthy individuals.
Infections — superficial types?
Folliculitis, impetigo, abscesses.
Other species — key opportunists?
S. epidermidis, S. hominis, S. saprophyticus.
Identification — key test?
Catalase-positive, coagulase-positive for S. aureus.
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