Strep and similar organisms (Exam 3) Flashcards

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1
Q

What are the beta strep groups?

A

Group A, B, C, F, and G

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2
Q

What is Lancefeild grouping based on?

A

The presence of polysaccharide and teichoic acid antigens in the bacterial cell wall

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3
Q

Which organism from this group is responsible for up tp 50% of bacterial endocarditis?

A

Viridans group

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4
Q

Which organism in this group can be identified by its unique gram stain?

A

Aerococcus/ GPC clusters

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5
Q

What test is used to differentiate species of Aerococcus?

A

LAP test

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6
Q

What test is used to confirm the identity of NVS species?

A

Staph streak test

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7
Q

Which organism of this group may have a pseudo catalase reaction?

A

Enterococcus

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8
Q

Which organism is susceptible to Bacitracin?

A

Strep A (pyogenes)

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9
Q

Which organisms is susceptible to Optichin?

A

Strep pneumoniae

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10
Q

Which organisms belong to the Strep anginosis group?

A

S. constellatus, S. intermedius, and S. anginosus

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11
Q

Organisms ID: small, grey alpha, GPC in clusters and tetrads; What tests confirm the ID?

A

Aerococcus; PYR +, BE =, NaCl +

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12
Q

Organism ID: no growth on BAP, grey/grey alphaish, tiny on CHOC; What test will confirm ID?

A

NVS; Staph streak

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13
Q

Organism ID: Beta hemolytic, heaped white, round colonies, GPB, has a bacterial Strep doppleganger that is very dangerous for pregnant women and the fetus. What is the suspected organisms, how do we differentiate these organisms?

A

Listeria monocytogenes; A positive catalase test will differentiate from GBS (S. agalactiae)

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14
Q

Which organisms is responsible for causing 50% of bacterial endocarditis?

A

Viridans Strep group

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15
Q

Which of these organisms can be ID’d by a positive PYR test or a result of BE + /NaCl + ?

A

Enterococcus

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16
Q

Organisms ID: PYR negative, BE +/ NaCl =

A

Group D Strep (Bovis group)

17
Q

Organism ID: PYR negative, BE = / NaCl +

A

Aerococcus

18
Q

Organism ID: PYR negative, BE = / NaCl =

A

Viridans Strep

19
Q

Organism ID: Oddball organism, usually GPC in pairs and tetrads, Vanc R

A

Pediococcus

20
Q

Organisms ID: Oddball organism, usually ovoid cocci, often in chains, Vanc R

A

Leuconostoc