Staphylococcus Flashcards

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1
Q

Staphylococcus

A
  1. Virulence: produce coagulases (coagulate the fibrinogen in blood, protecting bact. from phagocytosis)
    - - Some are virulent due to capsules
  2. Exotoxin
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2
Q

Staphylococcus aureus

A
  1. Enterotoxin (a kind of exotoxin): affects the intestines in the same way as cholera toxin; is also associated with toxic shock syndrome
  2. Scalded skin syndrome
  3. Food poisoning
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3
Q

Staphylococcus aureus

A
  1. Skin infections:
    a. Impetigo -
    b. Folliculitis
    c. Toxic shock syndrome
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4
Q

Staphylococcus epidermidies

A
  1. Coagulase-negative strains
  2. Very common on the skin, representing 90% of the normal microbiota
  3. Opportunistic; pathogenic only when skin barrier is broken
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5
Q

Staphylococcus aureus

A

Most pathogenic of the staphylococci; almost ALL pathogenic strains of S. aureus are coagulase positive
a. Coagulase: convert fibrinogen to fibrin, which protects the bacteria from phagocytosis

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6
Q

Folliculitis, sty, furuncle, abscess

A
  1. S. aureus infection of hair follicles
    The infected follicle of an eyelash is called a sty
  2. A more serious hair follicle infection is the furancle (boil)
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7
Q

Streptococcus pyogenes. toxins (move to another flash card!

A
  1. Streptokinases: dissolve blood clots
  2. Hyaluronidase: dissolves hyaluronic acid
  3. Deoxyribonucleases: degrades DNA
  4. Leukocidins: destroys leukocytes
  5. Erythrogenic toxins: responsible for the red rash and other symptoms of Scarlet Fever
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