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3 Microbiology > Gram +ve streptococci > Flashcards

Gram +ve streptococci Flashcards

1
Q

what is a way of identifying the type streptococci a bacteria is?

A

its interaction with red blood cells on agar plate

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2
Q

partial haemolysis of blood on agar plate indicates what type of streptococci?

A

a-haemolysis
oral streptococci

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3
Q

complete haemolysis of blood on agar plate indicates what type of streptococci?

A

b-haemolysis
group A streptococci -> S.pyogenes

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4
Q

no haemolysis of blood on agar plate indicates what type of streptococci?

A

y-haemolysis
enterococcus faecalis

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5
Q

what does GAS stand for?

A

group A streptococci

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6
Q

where does GAS -> S.pyogenes colonise

A

back of the throat (oropharynx)

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7
Q

what allows GAS -> S.pyogenes colonise the oropharynx?

A

M protein for binding
hyaluronic acid capsule that is similar to humans

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8
Q

how is GAS -> S.pyogenes identified?

A

presence of M protein

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9
Q

name three general things that GAS -> S.pyogenes causes

A

skin infections
upper respiratory tract infections
autoimmune diseases

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10
Q

what skin infections does GAS-S.pyogenes cause? 4

A

impetigo
celullitis
necrotising fasciitis
acute streptococcal gingivitis

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11
Q

what is impetigo?

A

highly contagious skin condition that causes sores and blister. very common in children

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12
Q

what is celullitis?

A

deeper infection of the dermis

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13
Q

what is necrotizing fasciitis?

A

destruction of connective tissue “flesh eating bug”

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14
Q

what is acute streptococcal gingivitis?

A

when Coughing causes the bacteria to spread to the gingiva

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15
Q

name an upper respiratory tract infection caused by GAS -> S.pyogenes

A

strep sore throat

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16
Q

what are the 3 symptoms of strep throat?

A

sudden, pain, fever

17
Q

what is scarlet fever?

A

severe form of strep throat with associated rash

18
Q

what can strep throat lead to?

A

pharyngitis

19
Q

how can you tell the difference between bacterial and viral strep throat?

A

viral has a cough present
no fever
and coryza (inflammation of nasal mucous membrane)

20
Q

name 2 autoimmune diseases caused the GAS - S.pyogenes

A

rheumatic fever
glomerularnephritis

21
Q

what does rheumatic fever effect?

A

the heart

22
Q

what does glomerularnephritis effect?

A

the kidneys

23
Q

GAS - S.pyogenes Have many virulence factors and super antigenic toxins what do these do?

A

overstimulate the immune system

24
Q

name 3 antibiotics used to treat GAS - S.pyogenes

A

penicillin V, amoxicillin, erythromycin

25
Q

what type of streptococci is this?

A

a- haemolysis
most oral streptococci

26
Q

what type of streptococci is this?

A

b-haemolysis
group A streptococci GAS -> S.pyogenes

27
Q

what type of streptococci is this?

A

y-haemolysis
enterococcus faecalis

28
Q
A

3 Microbiology (14 decks)

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