MICROEX2 Staph Key Terms Flashcards
Staphylococcus aureus
Pathogen?
Normal Flora?
Reservoir?
Usually considered pathogen
Normal flora when found in respiratory specimens
Reservoir in nasal vestibule
Staphylococcus epidermis
Pathogen?
Normal Flora?
Reservoir?
Not generally considered a pathogen unless found in obvious association with disease
Yes (opportunistic, nosocomial)
Skin surface, musous membranes
Staphylococcus saprophyticus
Pathogen?
Normal Flora?
Reservoir?
Pathogenic in UTIs
yes (opportunistic)
Skin, urogenital tract
What do colonies of Staphylococcus aureas look like on blood agar?
Large creamy/gold
What color are Micrococcus sp. colonies on blood agar?
yellow
Staphylococcus aureus is resistant to:
Heat
Dessication
High Salt concentration
Alcohol
Protein A
Staphylococcus aureus
Major antigenic component, antiphagocytis and anti-complementary properties
Lowers host resistance to other organism
Coagulase
Staphylococcus aureus
Produces a fibrin clot at site of infection
neutralizes bactericidal effects or normal serum
Alpha toxins and hemolysins
Staphylococcus aureus Nreaks down RBCs Inactivates leukocytes Increases tissue cell permeability May be dermonecrotic
Does Staphylococcus aureus have a capsule?
Yes
Leukocidins and hemolysins…
Staphylococcus aureus
Toxin
Inactivate antiphagocytis cells
Enterotoxin
Staphylococcus aureus
Toxin
causes disruption in Na/K pump in bowels producing diarrhea and vomiting
Exfoliative
Staphylococcus aureus
Toxin
Causes skin depolymerization and peeling
TSST
Staphylococcus aureus
Toxin
Causes toxic shock syndrom
Agressins
a class of enzymes which collectively act on host tissue to establish infections and relate to virulence