Staphylococcus and Streptococcus Flashcards
Which Staphylococcus species may cause UTI in women?
Staphylococcus saprophyticus
Which Staphylococcus species is responsible for subacute bacterial endocarditis?
Staphylococcus aureus
False about Staphylococcus
A. All are catalase negative
B.grow in the presence of 7.5% NaCl
C. Prefer aerobic conditions
A. All are catalase negative
Cos all are catalase positive
False about Staphylococcus aureus A. Has hemolysis B. Produces coagulase C. Ferments mannitol D. Resistant to novobiocin
D. Resistant to novobiocin
Sensitive sya. S.saprophyticus is the resistant one
False about Staphylococcus epidermidis A. All have hemolysis B. Does not produce coagulase C. Does not Ferment mannitol D. Sensitive to novobiocin
A. All have hemolysis
Some do not.
False about Staphylococcus saprophyticus A. All do not have hemolysis B. Does not produce coagulase C. Does not Ferment mannitol D. Resistant to novobiocin
C. Does not Ferment mannitol
Staphylcoccus epidermidis does not ferment mannitol
Coagulase (positive, negative) may cause nosocomial infection/ infection acquired fr health care facility
Negative
Enzyme produced by Staphylococcus staphyloticus; it destroys Staphylococci
Lyostaphin
Specific teichoic acid of Staph aureus cell wall
Ribitol teichoic acid
Specific teichoic acid of Staph epidermidis cell wall
Glycerol teichoic acid
Exotoxins of Staph aureus cause fever, true or false?
True
Toxic shock syndrome toxin is pyrogenic, and it may cause multiple organ dysfunction and shok. What enterotoxin is it nearly similar to?
Enterotoxin F
Why is S.aureus sensitive to lyostaphin?
Pentaglycine bridge
Staph aureus has staphylokinase. What is the action of this enzyme?
Lyses fibrin
Staphylococcal Scalded Skin Syndrome is mainly caused by exfoliatins. What is the mode of action of this enzyme?
Cleaves stratum corneum
Localized skin infections caused by Staphylococcus include all except: A.folliculitis B.boil C.impetigo D.carbuncle E. Scars
E.scars
What is the diff bet carbuncle and furuncle?
Furuncle: boil
Carbuncle: “choco na batok”
Systemic illnesses caused by Staphylococcus include all except: A. osteomyelitis B. pneumonia C. bacteremia D. Allergic rhinitis E.meningitis
D. Allergic rhinitis
Most common facial location of Staph aureus
Anterior nares
Diabetes mellitus is a predisposing factor of Staph aureus infection. True or false?
True
What is phage typing?
using battery of bacteriophages to trace carriers in hospital setting or epidemiological studies in the community
Drug of choice for methillin resistant Staph aureus
Vancomycin
Staph aureus can be treated by penicillinase-resistant penicillin or 1st-generation cephalosporin. True or false?
True
Exfoliative toxin (A,B) may be inactivated by EDTA treatment
A
Exfoliative toxin A is bigger than B. True or false?
False
Exfoliative toxin A has plasmid DNA while exfoliative toxin B has chromosomal DNA. True or false?
False. Baliktad
Toxic shock syndrome is often caused by Staph located in ____
Vagina
Patients with septic arthritis MOST often have staphylococci in what body fluid?
Synovial fluid
True or false: Streptococci do not require selective media
False, they require selective media
True or false: Streptococci- catalase-negative
True
False about Lancefield system A. Used to classify streptococci B. based on C substance of streptococcal capsule C. From type A to R D. All are false
B. based on C substance of streptococcal capsule
Cell wall dapat
Viridans streptococci and Strep pneumo have what type of hemolysis?
Alpha
Lancefield types A,B,C & G have ___ hemolysis
Beta
Strep pyogenes has gamma hemolysis, true or false?
False, beta hemolysis dapat.
Virulence factor that mediates hemolysis to epithelial cells
F protein
Difference between streptolysin S and streptolysin O
Streptolysin O is immunogenic
Strep species that Causes neonatal infection & postpartum sepsis
Strep agalactiae
Action of streptolysin S & O
Lyses blood cells and stimulates release of lysosomal enzymes
Strep species that may cause scarlet fever
Strep pyogenes
Strep group that causes abscess formation
“S.milleri” group
Strep group that Causes endocarditis and dental caries
Viridans group
