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M3 Microbiology > M5 Streptococci > Flashcards

M5 Streptococci Flashcards

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Biology 101 flashcards
1
Q

Most significant pathenogenic group of streptococci?

A

Group A streptococci

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2
Q

Type of haemolysis does Streptococcus Pyogenes undertake?

A

Beta - haemolytic

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3
Q

A disease that is caused by S.pyogenes?

A

Scarlet Fever

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4
Q

Number of evolutionary groupings of Streptococcus?

A

6

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5
Q

Name the 6 evolutionary groupings of streptococcus

A

Mitis, Anginosus, Pyogenic, Bovis, Salivarius, Mutans

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6
Q

define haemolysis

A

lysis of RBCs and release of their contents into the surrounding fluid

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7
Q

what are the 3 types of haemolysis?

A

Alpha, beta and gamma

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8
Q

what degree of haemolysis occurs on a blood agar plate and what colour is the plate with alpha haemolysis?

A

partial haemolysis of blood agar plate, green

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9
Q

example of alpha-haemolytic strep?

A

most oral streptococci

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10
Q

what degree of haemolysis occurs on a blood agar plate and what colour is the plate with beta haemolysis?

A

complete haemolysis of blood agar plate, plate is clear

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11
Q

example of beta haemolytic strep?

A

S.pyogenes and the anginosus group

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12
Q

what degree of haemolysis occurs on a blood agar plate and what colour is the plate with gamma haemolysis?

A

no haemolysis of blood agar plate, no show

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13
Q

example of gamma haemolytic strep?

A

enterococcus faecalis

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14
Q

describe Lancefield Grouping

A

further subdivision of Beta and Gamma haemolysis, based on carbohydrate content in bacterial cell wall

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15
Q

what are the LF groupings for beta haemolytic strep?

A

Group A, B, C, E, F

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16
Q

what is the LF grouping for gamma haemolytic strep?

A

Group D

17
Q

What group is further subdivided according to M protein antigen content?

A

Group A

18
Q

What does G.A.S stand for ?

A

Group A Streptococci

19
Q

A dental related infection caused by S.pyogenes?

A

Acute streptococcal gingivitis

20
Q

virulence factors of s.pyogenes?

A

superantigenic toxins, haemolysins, capsule, M proteins

21
Q

role of haemolysins?

A

cause tissue damage and ulceration

22
Q

diseases of the skin caused by s.pyogenes?

A

impetigo, cellulitus, necrotising fasciitis

23
Q

primary reservoir for s.pyogenes?

A

oropharynx

24
Q

key virulence factoer for evasion of host defences with s.pyogenes?

A

M proteins

25
Q

main way to distinguish between viral and bacterial throat infections?

A

viral = no fever, bacterial = fever

26
Q

autoimmune disease by s.pyogenes?

A

rheumatic fever

27
Q

throat infections by s.pyogenes?

A

scarlet fever, strep throat

M3 Microbiology (8 decks)

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