Staphylococcus aureus — Flashcards

Flashcard 1: What bug is the most common cause ofboth non-bullous and bullous impetigo?_____

Answer: Staph aureus

Flashcard 2: Furuncles and carbuncles are associated with what coagulase + organism? _____

Answer: Staph aureus

Flashcard 3: Staphylococcus epidermidis is gram _____

Answer: positive

Flashcard 4: Staphylococcus saprophyticus is gram _____

Answer: positive

Flashcard 5: Staphylococcus epidermidis is catalase _____

Answer: positive

Flashcard 6: Streptococcus pyogenes contains the enzyme _____,which breaks down connective tissue, allowing for the spread of cellulitis

Answer: hyaluronidase

Flashcard 7: Staphylococcus aureus shows what kind of hemolysis pattern? _____

Answer: B-hemolytic

Flashcard 8: Gas gangrene

Answer: Clostridium perfringens

Extra: alpha toxin causes myonecrosis and hemolysis

Flashcard 9: Gram stain status of Clostridium perfringens

Answer: Gram-positive (+)

Extra: Characteristics: - Morphology: Large, box-car shaped Gram-positive bacilli - Oxygen requirement: Anaerobe - Pathogenesis: Alpha toxin (lecithinase) - Clinical: Gas gangrene (myonecrosis), food poisoning

Flashcard 10: Characteristics of Clostridium botulinum:

Answer: Gram-positive bacilli, anaerobic, spore-forming

Extra: Clinical features: Botulism (descending paralysis), Floppy baby syndrome (infant botulism from honey). Toxin: Botulinum toxin (protease that cleaves SNARE proteins, preventing ACh release).