Question | Answer |
Whats tests can one perform to confirm the presence of Staph aureus? | Catalase (+), Coagulase (+), DNAse (+), Ferments glucose and mannitol so yellow on MSA agar |
List 3 infections Staph aureus causes. | Scalded Skin Syndrome, Endocarditis, osteomyelitis, cystitis, cellulitis, impetigo. |
What makes Staph aureus resistant to Ampicillin and Penicillin, and intermediate to Methicillin? | The enzyme beta-lactamase, which destroys the beta lactam ring of the antibiotic or the penicillin binding proteins. |
What are some of the factors that may predispose one to a SA infection? | Defects in leukocyte chemotaxis, skin injuries, underlying disease, and foreign bodies |
Describe the appearance of SA on BAP, chocolate, and MSA agars. | BAP- Beta-hemolysis, buttery texture, yellow, bigger then strep species
Chocolate- yellow, buttery like consistency, medium sized colonies
MSA- appears yellow due to the fermentation of mannitol, all other staphs cannot do that |