Lec 3-4 - Staph Flashcards

1
Q

three important staphs

A

staph aureus, staph epidermidis, staph saprophyticus

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2
Q

staph size

A

.7-1.2 microns

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3
Q

s aureus are usually blank color and blank hemolysis

A

off white or yellow, beta

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4
Q

s epidermidis are usually blank color colonies

A

opaque white

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5
Q

staph is not blank so it can grow on bunch of agars

A

fastidious

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6
Q

do staph form spores

A

no

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7
Q

do staph move

A

no

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8
Q

nutrients created by staph

A

facultative anaerobe

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9
Q

staph is catalase blank

A

positive usually

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10
Q

coagulase positive means blank

A

pathogenic staph

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11
Q

s aureus and intermedius is coagulase blank

A

positive

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12
Q

s epidermidis is coagulase blank

A

negative

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13
Q

peptidoglycan makes up this much of cell wall weight, teichoic acid makes up this much, protein a makes up this much

A

50, 40, 5

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14
Q

s aureus is resistant to blank but susceptible to blank

A

lysozyme, lysostaphin

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15
Q

teichoic acid binds to blank in the host

A

fibronectin

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16
Q

protein a binds to blank of antibodies

A

Fc

17
Q

s saprophyticus are usually in blank

A

genitourinary

18
Q

staph is associated with these parts of the mouth but not the gingival crevice

A

saliva, teeth

19
Q

staph and strep are usually the cause of blank lesions

A

root caries

20
Q

main carriers of s aureus

A

noses of hospital personnel, vagina during periods

21
Q

s epidermidis causes blank

A

uti hospital acquired (opportunistic), endocarditis, biofilms

22
Q

s saprophyticus causes blank

A

uti community acquired

23
Q

staph usually causes these infections

A

cutaneous, serious diseases, pneumonia, septicemia, food poisoning, toxic shock

24
Q

staph toxins are dangerous and can cause food poisoning and are superantigens and heat stable up to 100 degrees C for several minutes and can be used as a blank

A

bio warfare agent

25
Q

s epidermidis is blank resistant to methicillin

A

80 percent

26
Q

biofilm formation by s epidermidis is induced by blank and encoded by blank

A

stress, ica operon

27
Q

biofilm is often formed on blank

A

prosthetic devices

28
Q

penicilllin and methicillin are blank antibioitcs interfere with cell wall formation by messing with PBP

A

beta lactam

29
Q

vancomycin antibiotics are blank antibiotics and interfere with cell wall formation by binding to D Ala D Ala residues

A

glycopeptide

30
Q

vancomycin is used to treat blank infections

A

mrsa

31
Q

cyclic lipopeptide that binds to bacterial cell membrane causes rapid depolarization

A

daptomycin

32
Q

beta lactamase resistance is due to an enzyme that destroys the beta lactam ring via the encoding of this gene

A

blaZ

33
Q

intrinsic methiciillin resistance is from the staphylococcal cassette chromosome blank

A

mec (SCCmec)

34
Q

main way to tell apart HA MRSA and CA MRSA

A

HA MRSA doesnt have PVL (leukotoxin) but CA does

35
Q

HA infections are usually more blank

A

invasive

36
Q

CA infections are usually more blank

A

necrotizing

37
Q

CA infections are genetically different than HA and are susceptible to blank antibioitics

A

non beta lactam… such as tetracycline, sulfa drugs, vancomycin

38
Q

this is for s aureus screening

A

CHROMagar of nasal/rectal samples