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Infectious Agents > Classification of Pathogenic Bacteria (Gram-positives) > Flashcards

Classification of Pathogenic Bacteria (Gram-positives) Flashcards

1
Q

What is pathogenicity?

A

Varying capacity to cause disease.

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2
Q

What shape do staphylococci bacteria form?

A

Clusters.

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3
Q

What shape to streptococci bacteria form?

A

Chains.

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4
Q

What does the coagulase test differentiate?

A

Coagulase-postive staphylococci bacteria (aureus) from coagulase-negative staphylococci bacteria.

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5
Q

What are the two types of staphylococci aureus bacteria?

A

MSSA and MRSA

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6
Q

Where is staphylococci aureus found?

A

Nose, groin, hairline.

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7
Q

What types of diseases can staphylococci aureus cause?

A

Boils
Soft tissue infections
Septicaemia
Food poisoning

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8
Q

What makes staphylococci aureus penicillin resistant?

A

B-lactamase.

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9
Q

Which form of staph aureus is methicillin resistant?

A

MRSA

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10
Q

What are coagulase-negative staphylococci?

A

Skin commensals (not harmful).

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11
Q

What are the three types of streptococci?

A

A-haemolytic
B-haemolytic
Non haemolytic

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12
Q

How can you differentiate between alpha and beta haemolytic streptococci?

A

A turns blood agar green

B turns blood agar clear

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13
Q

What type of bacteria is streptococcus pneumoniae?

A

A-haemolytic

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14
Q

What 3 diseases does streptococcus pneumoniae cause?

A

Pneumonia
Meningitis
Septicaemia.

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15
Q

What type of bacteria is viridans streptococci?

A

A-haemolytic

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16
Q

What does viridans streptococci cause?

A

Infective endocarditis.

17
Q

How are B-haemolytic streptococci differentiated?

A

Lancefield groupings (A-G)

18
Q

What are the most clinically important B-haemolytic streptococci?

A

A, B and D.

19
Q

What group does streptococcus pyogenes come under?

A

Group A

20
Q

What does streptococcus pyogenes cause?

A

Sore throats
Cellulitis
Necrotising fasciitis

21
Q

What does streptococcus agalactiae cause?

A

Meningitis

Bacteraemia

22
Q

Where is streptococcus agalactiae found in around 25% of women?

A

Genital tract

23
Q

What group does enterococcus spp come under?

A

Group D

24
Q

Where is enterococcus spp found?

A

In the gut as normal commensal

25
Q

What does enterococcus spp cause?

A

UTI

26
Q

Where can C.Diff be carried asymptomatically?

A

In the gut of healthy people.

27
Q

What is C.Diff a cause of?

A

Diarrhoea associated with toxin production.

28
Q

How does C.Diff spread in hospitals?

A

Spores

29
Q

How can C.Diff be detected?

A

Detecting the antigen and toxin in stool sample by ELISA.

30
Q

Where is clostridium perfringens found?

A

Soil and normal commensal

31
Q

What can clostridium perfringens cause?

A

Food poisoning.

32
Q

What does clostridium tetani cause?

A

Tetanus

33
Q

What is the source of botox?

A

Clostridium botulinum

Bacillus anthracis

Infectious Agents (16 decks)

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