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Clinical Microbiology 2 > - > Flashcards

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1
Q

Enterococci isolated from urine shows up on the vancomycin agar screen test. What is the next step?

A

Look for pigment and set up motility and rapid xylose test

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2
Q

Aspergillus is best distinguished from Penicillium by..?

A

Arrangement of conidia

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3
Q

These lesions fluoresce under a Wood’s lamp

A

Erythrasma

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4
Q

Calcofluor white WITH KOH is for which organism?

A

Aspergillus

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5
Q

Abx used to treat MRSA w/ bone marrow suppression side effect

A

Linezolid

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6
Q

SP4 agar selects for..?

A

Mycoplasma

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7
Q

Most accurate detection of mecA-mediated oxacillin resistance is accomplished by..?

A

Testing cefoxitin via disc or broth method

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8
Q

Organism that is universally S to penicillin

A

S. pyogenes

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9
Q

Minimum amount of abx that INHIBITS VISIBLE GROWTH

A

MIC

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10
Q

Most sensitive indicator of carbapenamase production

A

Ertapenem

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11
Q

Correct pH of agar media?

A

7.2 - 7.4

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12
Q

Antibiotic of choice for whooping cough treatment

A

Erythromycin

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13
Q

Penicillin G is likely used for the treatment of this genital infection

A

Syphilis (Treponema pallidum)

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14
Q

Characteristic shared by Aeromonas, Plesiomonas, Vibrio

A

Oxidase production

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15
Q

How to tell Bacillus from Clostridium?

A

Clostridia rarely form spores aerobically - swell the cell when formed

Bacillus rarely form spores anaerobically - don’t swell the cell

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16
Q

Nodular lymphangitis caused by Sporothrix schenckii

A

Sporotrichosis

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17
Q

Microsporum, Trichophyton, Epidermophyton are genera associated with infections in…?

A

keratinized tissues

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18
Q

Bronchial brush collection is the best method for isolating this pathogen

A

Chlamydiophila pneumoniae

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19
Q

N. gonnrrhoeae is a ___________ (atmosphere) organism

A

capnophilic

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20
Q

gnb, curved gullwing

A

Campylobacter

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21
Q

Cause of acute exudative pharyngitis

A

S. pyogenes

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22
Q

How to determine S. aureus beta-lactamase production?

A

Assess zone edge of a susceptible penicillin disc diffusion test

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23
Q

Infection that would cause stools w/ watery flecks of mucous and cells

A

Cholera

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24
Q

CSF due to S. pneumoniae - what test to perform to best determine susceptibility to penicillin?

A

Penicillin MIC strip

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25
Most common causative agent of folliculitis
S. aureus
26
When would a physician treat a patient w/ an abx that is reported as "Intermediate"
The drug concentrates in the site of the infection
27
Characteristic skin lesions associated w/ Pseudomonas bacteremia, which manifest as a black eschar, are known as..?
Ecthyma gangrenosum (EG)
28
A bloody, cloudy and foul smelling urine is commonly seen in..?
Cystitis
29
Associated with CHRONIC paronychia
Candida albicans
30
Organism that is always reported when isolated from a vag-rectal swab
GBS
31
Purpose of KOH in Calcofluor White/KOH prep?
Clear all keratinized tissue
32
Penicillinase-resistant penicillin?
Oxacillin
33
Decarboxylase test - initially yellow if the organism is a __________ fermented
glucose
34
Fungi and AFB cultures usually yield this organism despite NG on routine media
Nocardia
35
Causes diarrheal disease, but not associated w/ systemic infection
E. coli O157:H7
36
'Bowling pin'- like yeast; growth enhanced around an olive oil saturated disc
Malassezia furfur
37
MIC is read where the trailing endpoint _______
starts
38
Appearance of normal flora on HEK
Yellow-orange, opaque
39
E. coli indole: ?
Indole positive
40
CLSI recommends this only for Enterobacteriacea and P. aeruginosa
mCIM
41
H. ducreyi causes this infection
Chancroid
42
S. aureus that is R to oxacillin but S to amoxicillin/clavulanic acid is most probably..?
a B-lactamase producing strain
43
Result of Salmonella on TSI
K/A H2S+ gas
44
This broth is better for Shigella than Selenite broth
GN broth
45
Organism associated w/ STIs that CANNOT be cultured
Treponema pallidum (syphilis)
46
Most commonly isolated carbapenemases?
Klebsiella pneumoniae carbapenemase (KPC)
47
Common bacterial cause of acute otitis MEDIA
S. pneumoniae (P. aeruginosa is for otitis EXTERNA)
48
A positive lecithinase test is indicated by..?
Zone of insoluble precipitates in the medium
49
Causes tinea versicolour
Malassezia furfur
50
Campy media may also grow these 2 organisms
- Pseudmonas | - Yeasts
51
Appearance of Salmonella on HEK
Clear, green w/ black center
52
A slow progression that does NOT usually involve muscle and bone; characterized by wart-like, cauliflower-like masses
Chromoblastomycosis
53
Result of E. coli on TSI
A/A gas
54
Localized cellulitis seen mostly on hands and fingers; associated w/ fishermen + meant and animal handlers
Erysipeloid
55
2 orgs that could be used in QC testing of motility media
E. coli | K. pneumoniae
56
2 infective agents that cause cervicitis
N. gonorrhoeae | Chlamydia trachomatis
57
Methods suitable for HLAR testing in enterococci?
Disc diffusion Agar dilution Broth dilution
58
A specimen suspected of this respiratory pathogen should be filtered before inoculation to media
Mycoplasma
59
Novobiocin: R => which organism?
Staph saprophyticus
60
How to detect VISA and VRSA in the lab?
Determine actual vancomycin MIC
61
Most sensitive substrate for direct detection of beta-lactamases
Nitrocefin
62
Inhibitor resistant TEM (IRT) are susceptible to..
inhibition by tazobactam only
63
Morphology of colonies that should be further investigated on CIN agar?
Pink bullseye
64
Result on Shigella on TSI
K/A
65
Abx used to treat MRSA w/ myopathies side effect (affects muscle function)
Daptomycin
66
Referred to as gas gangrene when caused by clostridia
Myonecrosis
67
NFBs would cause what result on a TSI slant?
K/NC
68
Cefoxitin disc diffusion test on E. coli is used to.. ?
Screen for AmpC beta-lactamase production
69
Associated w/ discharge of sulphur granules and "lumpy jaw"
Actinomyces israelii
70
Organism that can cause pseudo-appendicitis, multiplies in lymph nodes
Yersinia enterocolita
71
Most common cause of non-gonococcal urethritis
Chlamydia trachomatis
72
How does low pH of media affect aminoglycosides and macrolides?
False resistance
73
Used to detect staph BOUND coagulase + how a positive result looks like
Slide coagulase Agglutination with background clearing
74
Fementable carbohydrate in CIN media?
Mannitol
75
Organism implicated with transfusion related infections
Yersinia enterocolita (can survive refrigeration)
76
How does low pH of media affect tetracycline?
Falsely high potency (larger zone = false S)
77
Myonecrosis is a ________ extensive necrosis than that seen in myositis
more
78
Which organism has an erythrogenic toxin that causes scarlet fever, strawberry tongue, sandpaper rash
Streptococcus pyogenes (Grp A strep)
79
Only interpreted if mCIM is positive and is only used for __________
Enterobacteriacea
80
Significant patient factor that increases risk of VRE infection
Indwelling urinary catheter
81
Calcofluor white WITHOUT KOH is for which organism?
Pneumocystis
82
Minimum amount of abx that KILLS the organism
MBC
83
Chemical injury to lung tissues by aspirated stomach acids
Aspiration pneumonitis
84
Media appropriate for a rectal swab submitted for screening for an abx resistant organism on an adult patient transferred from another hospital
Bile esculin azide vancomycin agar
85
"Bull's eye" rash is characteristic of..?
Lyme disease
86
2 most common causative agents of epididymitis in men under 35
N. gonorrhoeae | Chlamydia trachomatis
87
gncb "school of fish" arrangement
Haemophilus ducreyi
88
Trailing endpoints can be seen with this abx
SXT
89
Appearance of Shigella on HEK
Clear, green
90
Media for rapidly screening for Aeromonas in a stool specimen
CIN

Clinical Microbiology 2 (14 decks)

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