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Unit 2 Chapter 14

Staphylococci

QuestionAnswer
S. aureus *commonly found* nose, but also known to inhabit the skin and vagina
S. aureus *characteristics* nonmotile, facultatively anaerobic, β-hemolytic, gram positive coccus.
S. aureus *testing results* positive for the slide coagulase test, tube coagulase test, and DNAse. It can grow in media containing up to 10% NaCl. Diagnostic procedures procedures include Gram stain, appropriate-site aerobic culture and teichoic acid antibody test
S. aureus *virulence factors* antiphagocytic proteins, lipase production, coagulase, enterotoxins, and exotoxins
S. aureus *epidemiology* Primary reservoir, Nares, Other reservoirs, Axillae, vagina, pharynx, and other skin surfaces, Hospital outbreaks, Nurseries, Burn units, Surgical patients,
S. aureus *infections* transmitted by direct human-to-human contact, aerosols, or environmental factors. Causes toxic shock syndrome, food poisoning, scalded skin syndrome, and abscesses virtually anywhere in the body.
S. epidermidis *colony morphology * nonmotile, facultatively anaerobic, non hemolytic
S. epidermidis *gram stain results * Gram-positive coccus.
S. epidermidis * testing results* Ferments maltose but not sucrose, xylose or trehalose. It is positive for alkaline phosphatase production and negative for coagulase DNase.
S. epidermidis *virulence factors * produce a slime layer that may enable them to attach to certain hospital apparati used in invasive procedures gaining entry to the body
S. epidermidis *epidemiology * opportunistic most common coagulase-negative Staphylococcus encountered clinically
S. epidermidis infections* antibiotic resistance and general weakened condition of a convalescing patient the infection is frequently fatal, health care aquired UTIs
S. saprophyticus *general * associated with UTIs in young women,; adheres more effectively to the epithelial cells lining the urogenital tract. Rarely found on other mucous membranes or skin surfaces. Found in low numbers in urine cultures; obligate anaerobe
staphylococi *colony morphology* yellow pigment, nonmotile, non-spore-forming, and aerobic or facultatively anaerobic except
staphylococi *gram stain results* Gram-positive cocci
staphylococi *testing results* a positive test is a clot formed in plasma due to staphylocoagulase. Clumping factor causes bacterial cells to agglutinate in plasma
Created by: luceroapril