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Aerobic Cocci Flashcards

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1
Q

Pathogenicity of Strep agalactiae

A

Group B specific antigen, infections in newborns and women who become ill after childbirth-endometritis and wound infections.

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2
Q

Pathogenicity of Strep pyogenes

A

Bacterial pharyngitis, pyoderma infections, rheumatic fever invasive Streptococcal infections

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3
Q

Pathogenicity of Strep pneumoniae

A

CA - Pneumonia, sinusitis, otitis media, bacteremia and meningitis

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4
Q

Pathogenicity of Strep viridians

A

subacute bacterial endocarditis, immunocompromised meningitis, abscesses, osteomyelitis

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5
Q

Pathogenicity of Enterococcus

A

UTI’s, wound infections, interabdominal abscesses

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6
Q

Pathogenicity of Pedicoccus

A

Isolated from saliva, stool, urine, and wounds, rarely causes disease but septicemia and bacteremia have been reported

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7
Q

Pathogenicity of Strep milleri (anginosus)

A

Abscesses and other pyogenic infections

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8
Q

Pathogenicity of Staph aureus

A

Skin and wound infections, food poisoning, scalded skin syndrome, toxic shock syndrome

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9
Q

Pathogenicity of Staph epidermidis

A

Predominantly hospital-acquired, with catheterization prosthetic heart valve implantation

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10
Q

Pathogenicity of Staph saprophyticus

A

UTI’s in young sexually active females

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11
Q

Pathogenicity of Micrococcus

A

Rarely causes infections

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12
Q

Pathogenicity of Stomatococcus

A

Opportunistic pathogen isolated most often from drug abuse

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13
Q

Colony and microscopic morphology of staphylococcus

A

White, smooth colonies, may or may not produce pigment or hemolysis, GPC in clusters or tetrads

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14
Q

Colony and microscopic morphology of beta Strep groups A & B

A

Group A - large zone of beta hemolysis, tiny PP colonies, gram pos. cocci in chains. Group B - narrow zone of beta hemolysis, small white colonies, gram pos. cocci in chains

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15
Q

Colony and microscopic morphology of Enterococcus

A

Small white colonies with disappearing borders, can show any hemolysis, gram pos cocci in chains

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16
Q

List tests to distinguish between Staphylococcus aureus and other Staphylococcus species

A

Staph aureus has a positive coagulase test and latex

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17
Q

What test distinguishes Staphylococci from Streptococci

A

Catalase

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18
Q

Discuss the types of hemolysis and what is happening to the RBCs

A

Beta - complete clearing of RBCs (clear, yellow)
Alpha - partial lysis of RBCs (Green)
Gamma - No change in background

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19
Q

Does beta hemolysis always indicate the presence of Streptococci

A

no

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20
Q

3 ways to identify enterococcus

A

Automated systems, PYR, Bile esculin and 6.5% NaCl

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21
Q

Describe the leucine aminopeptidase test (LAP) and list the organisms it differentiates.

A

Leucine aminopeptiase is a peptidase that hydrolyzes peptide bonds adjacent to a free amino group. Because LAP reacts most quickly with Leucine. The addition of DMACA causes a red color to develop in pos. tests.

  • LAP differentiates Aerococcus and Leuconostoc from other GPC.
  • LAP positive for strept, entero, and pediococcus spp.
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22
Q

Significance of vancomycin resistant Enterococcus, including how the genetic material is acquired

A

Widespread use of vancomycin has led to VRE. There are two choices for VRE: synercid and linezolid. Proteins encoded by vanA and vanB genes give its resistance. Enterococcus spp containing the Van A phenotype are highly resistant. Modify peptidoglycan termini, N-acyl-D-Ala-D-Ala, involved in cross-linking to N-Acyl-D-Ala-D-Lactate.

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23
Q

Compare and contrast hospital aquired MRSA and community aquired MRSA

A

Hospital: HA-MRSA is the name for infections acquired while in the hospital recently, long term care, dialysis, or indwelling devices

Community: CA-MRSA is the name for infections amongst people who lack traditional healthcare associated risk factors. Outbreaks have been among athletes, correctional facility inmates, military recruits in barracks, pediatric patients and tattoo recipients.

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24
Q

Virulence factors for Streptococcus

A
  • M protein
  • Enzymes (Streptolysin O and S)
  • DNAase A-D
  • Streptokinase A and B
  • Pyrogenic toxins A-C
  • Capsule
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25
Q

Virulence factors for Staphylococcus

A
  • Enterotoxins A, D, F
  • Exfoliative toxin
  • Cytolytic toxin (affect WBCs and RBCs)
  • Enzymes (coagulase, hyaluronidase, lipase)
  • Protein A (bind to Igs)
  • Mec A gene/PBP₂
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26
Q

Give the principle of the rapid direct antigen Streptococcal test for beta-hemolytic group A Streptococcus done on throat swabs for slide agglutination and ELISA

A

Slide agglutination: Extracts C carbohydrate, which is a specific group antigen. This is done by heat or acid and it agglutinates with specific antisera.

ELISA: Uses specific antibodies which matches to strep groups and another antibody with enzyme tag is added to enhance.

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27
Q

The historical capsular swelling used for the rapid ID of Strep pneumoniae is also know as

A

Quellung or Neufeld reaction

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28
Q

With Strep pneumoniae, virulence is directly proportional to the?

A

The polysaccharide capsule and its antiphagocytic activity

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29
Q

Name 3 tests used in identifying Streptococcus pneumoniae. Strep pneumonia is A BOSS mnemonic

A

Optochin, automated procedures, bile solubility, Quellung, Antigen typing

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30
Q

What substance present on the cell wall of Group A Beta Strep is responsible for virulence of the organism?

A

M protein

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31
Q

What role does Strep pyogenes play in rheumatic fever?

A
  1. Antibodies attach to heart valves, and tissue damage occurs
  2. Exotoxin damage
  3. Invasion of heart tissue
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32
Q

Why does someone who has had a Strep throat infection get another?

A

80 different M protein serotypes (each with a unique Ab response)

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33
Q

Describe a secondary condition to a Strep throat infection.

A

Glomerulonephritis

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34
Q

What is the antibiotic of choice in treating group A beta-hemolytic Streptococci infections? What if the patient is allergic to the drug of choice?

A

Penicillin, Erythromycin

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35
Q

Describe Staphylococcal food poisoning.

A

Enterotoxins A and D cause symptoms to appear in 2 to 8 hours and resolve within 6-8 hours

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36
Q

Explain the difference between the slide and tube coagulase tests and which type of coagulase does each measure?

A

Bound Coagulase or slide coagulase: detects enzyme that connects fibrinogen to fibrin on surface of cell, clumping factor.

Free Coagulase or tube - Detects enzyme that is excreted away from cell wall, staphylocoagulase.

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37
Q

Discuss the different testing methodologies used in the ID of MRSA.

A 
Agglutination-PBP₂
Automated for Mec A gene
Oxacillin
Cefotoxin
MRSA media (CHROM agar)
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38
Q

What is the gram stain and morphology of Neisseria?

A

Gram Neg diplococci

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39
Q

What antibiotics are in Modified Thayer Martin plates and what is the purpose of each?

A

Vancomycin: inhibits GPC
Colistin: inhibits GNR
Trimethoprim: Prevents Proteus swarming
Nystatin: Prevents growth of Fungi

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40
Q

What tests are commonly used to differentiate species of Neisseria?

A

N. gonorrhoeae: growth only on chocolate plate, glucose pos, other sugars neg.

N. meningitidis: growth on BAP and chocolate plate, glucose/maltose pos, other sugars neg.

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41
Q

Discuss the pathogenicity of Neisseria meningitidis

A

May have a capsule, endotoxin production, pili and IgA protease, all of which contribute to the virulence and pathogenicity.

42
Q

Indicate the significance of the meningocococcus vaccination. Discuss the serogroups that covered by the vaccination and those that are not.

A

Used on people ages 11 to 55 years and covers all serogroups except B.

43
Q

Associate the specific serogroup of Neisseria meningitidis with Waterhouse-Frederichsen syndrome.

A

Serogroup B

44
Q

What non-culture tests are available to detect Neisseria gonorrhoeae.

A

Fluorescent test, direct micro exam, immunologic, nucleic acid probe

45
Q

Describe two methods of performing the oxidase test and the chemicals involved

A

Filter paper or direct plate, using the reagent 1% dimethyl or tetra methyl-p-phenylene diamine dihydrochloride.
-put organism on filter paper followed by reagent or vice versa

46
Q

Pathogenicity of Moraxella catarrhalis

A

Upper respiratory, middle ear, and eye infections.

47
Q

Identify tests and their methodology used in the ID of Moraxella catarrhalis

A

Organisms will grow on BAP and CHOC, smooth hockey puck colonies, asaccharolytic and may be differentiated by positive DNase and butyrate esterase reactions.

48
Q

Compare and Contrast the different Neisseria meningitidis serogroups and disease states they cause.

There are 13 meningococcal encapsulated serogroups, but strains A, B, C, Y and W-135 are most often associated with epidemics.

Serogroup A-

Serogroup B and C-

Serogroup Y-

Serogroup W-135-

A

Serogroup A- Pandemics

Serogroup B and C- Most common in USA, with group B involved in community acquired

Serogroup Y- Primarily causes menigococcal pneumonia

Serogroup W-135- Often responsible for invasive disease

49
Q

Describe the principle of the Superoxol test and organize the different organisms it tests for and their expected results.

A

The superoxol test uses 30% H₂O₂ and is the same as the catalase test. Colonies of N. gonorrhoeae produce immediate vigorous bubbling (positive)

Colonies of N. meningitidis and N. lactamica produce weak delayed bubbling (negative).

50
Q

Principle of catalase test

A

The enzyme catalase mediates the breakdown of hydrogen peroxide into oxygen and water. Bubbles is positive

51
Q

Principle of hippurate hydrolysis test

A

Detect the ability of bacteria to hydrolyse substrate hippurate into glycine and benzoic acid by action of hippuricase enzyme. Purple = positive

52
Q

Serological Strep grouping

A

Grouping Streptococcus depending on catalase-negative, coagulase-negative bacteria based on the carbohydrate composition

53
Q

Principle of PYR test

A

Enzyme L-pyrrolidonyl arylamidase hydrolyzes the L-pyrrolidonyl- β-naphthylamide substrate to produce a β-naphthylamine. Pink = positive (enterococcus)

54
Q

Principle of Bile solubility test

A

Based on the observation that Streptococcus pneumoniae will visibly lyse with 2% or 10% sodium. Clear = positive

55
Q

Principle of Optochin test

A

Inhibits the growth of Streptococcus pneumoniae at very low concentration. No growth around disk = suseptible

56
Q

Principle of 6.5% NaCl test

A

This test determines whether the microbe can grow in a medium containing 6.5% sodium chloride (NaCl). Yellow is positive (Enterococcus) . Purple is neg (nonenterococcus)

57
Q

Principle of Bile esculin test

A

Based on the hydrolysis of esculin into glucose and esculetin. More than half the media is brown = positive.

58
Q

Principle of CAMP test

A

Produce a diffusible extracellular hemolytic heat-stable protein (CAMP factor) that acts synergistically with the beta-lysin. Arrowhead is positive

59
Q

What is the principle behind the latex agglutination testing for Staphylococcus species:

A

Plasma coated latex particles that contain fibrinogen and non-specific IgG on surface. Staph aureus has clumping factor that reacts with the fibrinogen and Protein A that will react non-specifically with the FC portion of the IgG.

60
Q

Morphology of Staph aureus

A

large, round, golden-yellow colonies, GPC, beta hemolysis

61
Q

Morphology of Staph saprophyticus

A

Glossy, smooth, and convex. Buttery colony that may be white, cream, yellow, or orange. Gamma

62
Q

Morphology of Beta hemolytic strep

A

White-greyish color and are surrounded by a zone of β-hemolysis

63
Q

Morphology of Alpha hemolytic strep

A

White-greyish color and are surrounded by a zone of alpha (green) hemolysis

64
Q

Morphology of non hemolytic strep

A

White-greyish color and are surrounded by a zone of gamma(no lysis) hemolysis

65
Q

Morphology of Enterococci

A

similar to strep colonies

66
Q

Morphology of Strep pneumoniae

A

Small grey, dip down like donut, alpha hemolysis

67
Q

Organisms most frequently isolated from Premature baby

A

Staphylococcus aureus and Candida

68
Q

Differentiate between community and hospital acquired pneumonia and organism associated with each.

A

Community - Strep pneumoniae

Hospital - P. aeruginosa, Enterobacter

69
Q

Strep pyogenes tests

Hemolysis:
Bacitracin:
SXT:
CAMP test:
Hippurate Hydrolysis:
LAP:
PYR:
Bile Esculin:
NaCl(6.5%):
Optochin:
Vancomycin:
Bile Solubility:
A 
Hemolysis: Beta
Bacitracin: S
SXT: R
CAMP test: =
Hippurate Hydrolysis: =
LAP: +
PYR: +
Bile Esculin: =
NaCl(6.5%): =
Optochin: R
Vancomycin: S
Bile Solubility: =
70
Q

Strep agalactiae tests

Hemolysis:
Bacitracin:
SXT:
CAMP test:
Hippurate Hydrolysis:
LAP:
PYR:
Bile Esculin:
NaCl(6.5%):
Optochin:
Vancomycin:
Bile Solubility:
A 
Hemolysis: Beta
Bacitracin: R
SXT: R
CAMP test: +
Hippurate Hydrolysis: +
LAP: +
PYR: =
Bile Esculin: =
NaCl(6.5%): V
Optochin: R
Vancomycin: S
Bile Solubility: =
71
Q

Enterococcus tests

Hemolysis:
Bacitracin:
SXT:
CAMP test:
Hippurate Hydrolysis:
LAP:
PYR:
Bile Esculin:
NaCl(6.5%):
Optochin:
Vancomycin:
Bile Solubility:
A 
Hemolysis: Beta/Alpha/Gamma
Bacitracin: R
SXT: R
CAMP test: =
Hippurate Hydrolysis: V
LAP: +
PYR: +
Bile Esculin: +
NaCl(6.5%): +
Optochin: R
Vancomycin: S/R
Bile Solubility: =
72
Q

Strep equines/bovis tests

Hemolysis:
Bacitracin:
SXT:
CAMP test:
Hippurate Hydrolysis:
LAP:
PYR:
Bile Esculin:
NaCl(6.5%):
Optochin:
Vancomycin:
Bile Solubility:
A 
Hemolysis: Beta
Bacitracin: V
SXT: S
CAMP test: =
Hippurate Hydrolysis: =
LAP: +
PYR: =
Bile Esculin: =
NaCl(6.5%): =
Optochin: R
Vancomycin: S
Bile Solubility: =
73
Q

Strep pneumoniae tests

Hemolysis:
Bacitracin:
SXT:

Hippurate Hydrolysis:
LAP:
PYR:
Bile Esculin:
NaCl(6.5%):
Optochin:
Vancomycin:
Bile Solubility:
A

Hemolysis: Alpha
Bacitracin: R
SXT: S

Hippurate Hydrolysis: =
LAP: +
PYR: =
Bile Esculin: =
NaCl(6.5%): =
Optochin: S
Vancomycin: S
Bile Solubility: +
74
Q

Strep viridians tests

Hemolysis:
Bacitracin:
SXT:

LAP:
PYR:
Bile Esculin:
NaCl(6.5%):
Optochin:
Vancomycin:
Bile Solubility:
A

Hemolysis: Alpha
Bacitracin: V
SXT: S

LAP: +
PYR: =
Bile Esculin: =
NaCl(6.5%): =
Optochin: R
Vancomycin: S
Bile Solubility: =
75
Q

Strep milleri tests

Bacitracin:

LAP:
PYR:
Bile Esculin:
NaCl(6.5%):
Optochin:
Vancomycin:
Bile Solubility:
A

Bacitracin: R

LAP: +
PYR: =
Bile Esculin: =
NaCl(6.5%): =
Optochin: R
Vancomycin: S
Bile Solubility: =
76
Q

Abiotrophia tests

Hemolysis:

LAP:
PYR:

Vancomycin:

A

Hemolysis: Alpha/Gamma

LAP: +
PYR: +

Vancomycin: S

77
Q

Granulicatella tests

Hemolysis:

LAP:
PYR:

Vancomycin:

A

Hemolysis: Alpha/Gamma

LAP: +
PYR: +

Vancomycin: S

78
Q

Aerococcus tests

Hemolysis:

Hippurate Hydrolysis:
LAP:
PYR:
Bile Esculin:

Vancomycin:

A

Hemolysis: Alpha

Hippurate Hydrolysis: V
LAP: =
PYR: +
Bile Esculin: V

Vancomycin: S

79
Q

Helocococcus tests

Hemolysis:

Hippurate Hydrolysis:
LAP:
PYR:
Bile Esculin:

Vancomycin:

A

Hemolysis: Alpha/Gamma

Hippurate Hydrolysis: =
LAP: =
PYR: +
Bile Esculin: =

Vancomycin: S

80
Q

Leuconostoc tests

Hemolysis:
LAP:
PYR:
Bile Esculin:
Vancomycin:
A 
Hemolysis: Gamma
LAP: =
PYR: =
Bile Esculin: +
Vancomycin: R
81
Q

Gemella tests

Hemolysis:

Hippurate Hydrolysis:
LAP:
PYR:
Bile Esculin:
NaCl(6.5%):

Vancomycin:

A

Hemolysis: Alpha/Gamma

Hippurate Hydrolysis: =
LAP: +
PYR: +
Bile Esculin: =
NaCl(6.5%): =

Vancomycin: S

82
Q

Pediococcus tests

Hemolysis:

Hippurate Hydrolysis:
LAP:

Vancomycin:

A

Hemolysis: Alpha
Hippurate Hydrolysis: +
LAP: =
Vancomycin: R

83
Q

Tetragenococcus tests

Hemolysis:

Hippurate Hydrolysis:
LAP:

Vancomycin:

A

Hemolysis: Alpha
Hippurate Hydrolysis: +
LAP: =
Vancomycin: S

84
Q

Lactococcus tests

Hippurate Hydrolysis:
LAP:
Vancomycin:

A

Hippurate Hydrolysis: +
LAP: +
Vancomycin: S

85
Q

Staph aureus tests

Hemolysis:
Catalase:
Coagulase:
Polymyxin B:
Novobiocin:
PYR:
Oxidase:
Lysosome:
Lysostaphin:
Bacitracin:
A 
Hemolysis: BETA
Catalase: +
Coagulase: +
Polymyxin B: S
Novobiocin: S
PYR: =
Oxidase: =
Lysosome: R
Lysostaphin: S
Bacitracin: R
86
Q

Staph saprophyticus tests

Catalase:
Coagulase:
Polymyxin B:
Novobiocin:
PYR:
Oxidase:
A 
Catalase: +
Coagulase: =
Polymyxin B: S
Novobiocin: R
PYR: =
Oxidase: =
87
Q

Staph epidermidis tests

Catalase:
Coagulase:
Polymyxin B:
Novobiocin:
PYR:
Oxidase:
A 
Catalase: +
Coagulase: =
Polymyxin B: R
Novobiocin: S
PYR: =
Oxidase: =
88
Q

Staph haemolyticus tests

Catalase:
Coagulase:
Polymyxin B:
Novobiocin:
PYR:
Oxidase:
A 
Catalase: +
Coagulase: =
Polymyxin B: S
Novobiocin: S
PYR: +
Oxidase: =
89
Q

Staph hominis tests

Catalase:
Coagulase:
Polymyxin B:
Novobiocin:
PYR:
Oxidase:
A 
Catalase: +
Coagulase: =
Polymyxin B: S
Novobiocin: S
PYR: =
Oxidase: =
90
Q

Staph warneri tests

Catalase:
Coagulase:
Polymyxin B:
Novobiocin:
PYR:
Oxidase:
A 
Catalase: +
Coagulase: =
Polymyxin B: S
Novobiocin: S
PYR: =
Oxidase: =
91
Q

Micrococcus tests

Catalase:
Coagulase:
Oxidase:
Lysosome:
Bacitracin:
A 
Catalase: +
Coagulase: =
Oxidase: +
Lysosome: S
Bacitracin: S
92
Q

Strep pyogenes

Bacitracin:
SXT:

A

Bacitracin: S
SXT: R

93
Q

Strep agalactiae

Bacitracin:
SXT:

A

Bacitracin: R
SXT: R

94
Q

Strep equines/bovis

Bacitracin:
SXT:

A

Bacitracin: V
SXT: S

95
Q

Enterococcus

Bacitracin:
SXT:

A

Bacitracin: R
SXT: R

96
Q

Strep pneumoniae

Bacitracin:
SXT:

A

Bacitracin: R
SXT: S

97
Q

Strep viridians

Bacitracin:
SXT:

A

Bacitracin: V
SXT: S

98
Q

Strep pneumoniae colony morphology

A

Alpha hemolysis, older colonies-coinlike appearance, mucoid, gram pos. diplococci-lancet.

99
Q

Principle of bacitracin test

A

Used to determine the effect of a small amount of bacitracin on an organism. Strep pyogenes is usually susceptible.

100
Q

Principle of Carbohydrate utilization test

A

Carbohydrate utilization test is used to determine whether or not a bacteria can utilize a certain carbohydrate which produces acid. Red = negative

101
Q

Principle of Cefinase test

A

Rapid testing of isolated colonies of Neisseria gonorrhoeae, Staphylococcus and Enterococcus species as well as Hameophilus influenzae.

Detects beta lactamases

102
Q

Principle of beta lactamase test

A

Detects the enzyme beta-lactamase, which confers penicillin resistance to various bacterial organisms

Microbiology (14 decks)

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