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Dermatology > Microbiology > Flashcards

Microbiology Flashcards

1
Q

In staphylococcus gram negative or positive?

A

Positive

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2
Q

Does staphylococcus stay in clusters or chains?

A

Clusters

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3
Q

Is staphylococcus aerobic or anaerobic (and how strictly!)

A

Aerobic and facultatively anaerobic (grows best in air but does also grow anaemically)

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4
Q

Name a coagulase positive staphylococcus

A

Staph aureus

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5
Q

Name a coagulase negative staphylococcus

A

Staph epidermidis

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6
Q

Which organism shows a golden colour on agar?

A

Staph aureus

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7
Q

Which organism stains white on agar?

A

Coagulase negative staph

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8
Q

What does coagulase positive mean?

A

It will clot plasma

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9
Q

Give an example of alpha haemolytic streptococcal organisms

A

Strep pneumoniae

Strep viridans

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10
Q

Give an example of beta haemolytic streptococci?

A

Group A Strep (throat infection)

Group B strep (Neonatal meningitis)

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11
Q

How do coagulase negative staphylococci usually cause infection?

A

By coming into association with prosthetic material; causing a slime to form

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12
Q

What does beta haemolytic mean in terms of hamolysis?

A

Complete hameolysis

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13
Q

What does alpha haemolytic mean in terms of haemolysis?

A

Partial haemolysis

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14
Q

What does gamma haemolytic mean in term of haemolysis?

A

No haemolysis

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15
Q

Describe streptococcus bacteria:

A

Gram positive cocci in chains that are aerobic (but can grow anaerobically)

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16
Q

Give an example of a non haemolytic streptococci

A

Enterococcus

17
Q

Describe what has happened in staphylococcal scalded skin syndrome

A

Staphylococcus releases an exfoliating toxin which acts high up in the epidermis. Toxin A causes blistering at the site of the infection (called bullous impetigo) whilst toxin B spreads through the body causing widespread blistering.

18
Q

How do you treat SSS?

A

Flucloxacillin

19
Q

What bacteria most commonly causes boils?

A

Staph aureus

20
Q

Give an example of a group A streptococcus

A

Strep pyogenes

21
Q

What is the best antibiotic for staph aureus infections?

A

Flucloxacillin

22
Q

How do you treat necrotising fascists?

A

Surgical debridement and antibiotics

23
Q

What is tinea?

A

Ringworm

24
Q

What is tinea corporis?

A

Ringworm of the body?

25
Q

What is tine pedis also known as?

A

Athletes foot?

26
Q

What is tinea capitis?

A

Ringworm of the head

27
Q

Can tinea ever be invasive?

A

No, it only affects keratinise tissues (e.g. skin, hair, nails)

28
Q

If you want to send off a sample querying ringworm how do you do it?

A

Skin scraping in a dermapack for microscopy and culture

Dermatology (7 decks)

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