Streptococo pyogenes Flashcards

1
Q

Metabolismo

A

Anaerobio facultativo

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2
Q

Gram

A

Gram positivo

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3
Q

Movimiento

A

Sin movimiento

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4
Q

Esporulación

A

No forma esporas

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5
Q

Cápsula

A

Algunas tienen cápsula de ácido hialuronico (protege de fagocitosis)

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6
Q

Catalasa

A

Negativo

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7
Q

Hemólisis

A

B-hemolítico

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8
Q

Clasificación Lancefield

A

Grupo A

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9
Q

Toxinas y virulencia

A
  1. Proteína M: evita fagocitocis
  2. Peptidasa: de C5a es quimiotáctica de neutrófilos)
  3. Toxinas: aquí actúan como superantígenos)
    a) Estreptolisina S (suero): hemolisina que destruye macrófagos
    b) Estreptolisina O (oxígeno): lisa eritrocitos, leucocitos, plaquetas
    c) Estreptocinasa (A y B): lisa coágulos de sangre y depósitos de fibrina
  4. Spe (Exotoxinas pirógenas estreptocócicas) SpeA, SpeaB, SpeC, SpeF
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10
Q

Enfermedades

A
  1. Faringitis
    (complicaciones)
    - Escarlatina
    - Abscesos
    - Fiebre reumática
    - Glomerulonefritis post
  2. Impétigo
  3. Erisipela: Infección bien delimitada de la piel
  4. Fascitis necrosante: come carne
  5. Sx de choque tóxico: cepas M1 y M3, toxinas SpeA y SpeC
  6. Fiebre reumática: Antígenos M1, M3, M5, M18
  7. Glomerulonefritis postetreptocócica
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11
Q

Tratamiento

A

Muy sensible a penicilina y bacitracina

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12
Q

Cadenas

A

Cortas

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