6.9. Skin and Soft Tissue Infection - Toxin Mediated Syndromes Flashcards

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1
Q

What causes Toxin Mediated Syndromes?

A

Superantigens, a group of Pyrogenic Exotoxins

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2
Q

How do Superantigens activate the immune system?

A

Not via the normal contact between Antigen Presenting Cell (APC) and T-Cells:
.1 Superantigens bypass APC, and attach directly onto the T-Cell Receptors, activating up to 20% of the pool, instead of the normal 0.01%
2. This causes a massive burst in Cytokine release

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3
Q

What does the massive burst in Cytokine release cause?

A
  1. Endothelial Leakage
  2. Haemodynamic Shock
  3. Multi-organ failure
  4. Death
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4
Q

What is the most common causative infectious agent of Toxin Mediated Syndromes?

A
  1. Strains of Staphylococcus Aureus:
  2. a) Toxic Shock Syndrome Toxin-1 (TSST-1)
  3. b) Endothelial A Receptor (ETA) and Endothelial B Receptor (ETB)
  4. Strains of Streptococcal Pyogenes:
  5. a) Toxic Shock Syndrome Toxin-1 (TSST-1)
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5
Q

What are the most common Toxin Mediated Syndromes?

A
  1. Staphylococcal Toxic Shock Syndrome
  2. Streptococcal Toxic Shock Syndrome
  3. Staphylococcal Scalded Skin Syndrome
  4. Panton-Valentine Leucocidin Toxin Syndrome
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6
Q

What is Toxic Shock Syndrome associated with?

A
  1. 1980’s - high absorbency tampons during menses
  2. Small skin infections due to Staphylococcus Aureus secreting Toxin Shock Syndrome Toxin -
    1 (TSST-1)
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7
Q

What is the Diagnostic Criteria for Staphylococcal Toxic Shock Syndrome?

A
  1. Fever
  2. Hypotension
  3. Diffuse Macular Rash
  4. Three of the following organs involved: Liver, Blood, Renal, GI, CNS, Muscular
  5. Isolation of Staphylococcus Aureus from Mucosal / Normally Sterile Sites
  6. Production of TSST1 by isolate
  7. Development of antibody toxin during convalescence
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8
Q

What is Streptococcal Toxic Shock Syndrome associated with?

A

The presence of Streptococci in deep seating infections, such as:
1. Erysipelas
2. Necrotising Fasciitis

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9
Q

Is the Streptococcal Toxic Shock Syndrome mortality rate higher or lower than the Staphylococcal Toxic Shock Syndrome?

A

Streptococcal Toxic Shock Syndrome has a much higher mortality rate:
1. Streptococcal Toxic Shock Syndrome - 50%
2. Staphylococcal Toxic Shock Syndrome - 5%

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10
Q

What is the treatment of Toxic Shock Syndrome?

A
  1. Removal of offending agent (e.g. Tampon)
  2. I.V. Fluids
  3. Ionotropes
  4. Antibiotics
  5. I.V. Immunoglobulins
  6. Urgens Surgical Debridement of the infected Tissue (Strep. TSS)
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11
Q

What is Staphylococcal Scalded Skin Syndrome infection due to?

A

A particular strain of Staphylococcus Aureus which produces:
1. Exfoliative Toxin A
2. Exfoliative Toxin B

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12
Q

How is Staphylococcal Scalded Skin Syndrome characterised?

A
  1. Widespread Bullae
  2. Skin Exfoliation
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13
Q

Which group of people is Staphylococcal Scalded Skin Syndrome most commonly found?

A

Children
Note - it can occur in adults as well

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14
Q

What is the treatment of Staphylococcal Scalded Skin Syndrome?

A
  1. I.V. Fluids
  2. I.V. Antimicrobials
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15
Q

What is the mortality rate of Staphylococcal Scalded Skin Syndrome?

A

3% in children
Higher in adults who are often immunocompromised

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16
Q

What is the Panton-Valentine Leucocidin Toxin?

A

A Gamma Haemolysin

17
Q

How is the Panton-Valentine Leucocidin Toxin transferred?

A

It can be transferred from one strain so Staphylococcus Aureus to another (including MRSA)

18
Q

What can the Panton-Valentine Leucocidin Toxin cause?

A
  1. Skin and Soft Tissue Infection
  2. Haemorrhagic Pneumonia
19
Q

Who does the Panton-Valentine Leucocidin Toxin tend to affect?

A
  1. Children
  2. Young Adults
20
Q

How do patients with Panton-Valentine Leucocidin Toxin Syndromes present?

A

Recurrent Boils (Furunculosis) which are difficult to treat

21
Q

How are Panton-Valentine Leucocidin Toxin Syndromes treated?

A

Antibiotics which reduce the Toxin Production