Gram positive cocci Flashcards

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1
Q

Staphylococcus aureus

Attack

  • lungs
  • CVS
  • CNS = Bacteraemia = sepsiaemia
  • bones
A

Morphology

  • Catalase pos
  • Anaerobic
  • caugulase pos
  • non-spore forming

Virulence

  • protein A; binds to IgG preventing opsonization and preventing phagocytosis
  • Hemolysis
  • penicillinase
  • hyaluronidase: breaks down connective tissue

Clinically

  • Gastroenteritis ( food poisoning )
  • Toxic shock syndrome
  • Pneumonia
  • meningitis
  • bacteraemia
  • osteomyeitis
  • skin infection
  • urinary infection

Treatment
*resistant to penecillin
Treat with vancomycin
*Clindamycin

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2
Q

Staphylococcus epidermidis

Nosocomial infection

A

Metabolism

  • catalase pos
  • anaerobic
  • coagulase neg

Virulence

  • Polysaccharide: Adhere to prosthetic devices
  • resistant to antibodies

Clinical

  • Prosthetic joints
  • Prosthetic heart valves
  • Urinary tract infection

Treatment
vancomycin

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3
Q

Staphylococcus saprophyticus

A

Metabolism
coagulase-positive
faculatative anaerobe
coagulase neg

Clinical
*urinary infection in sexually active females

Treatment
Penicillin

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