Staphylococcus epidermis

Cards (31)

  • What are the characteristics of coagulase negative Staphylococcus?
    • Gram-positive cocci in grape-like clusters
    • Non-hemolytic on blood agar
    • Catalase positive but coagulase negative
    • Do not ferment mannitol
    • Resistant to polymyxin B
  • What is Staphylococcus epidermidis known for?
    Normal flora of the skin
  • What does Staphylococcus epidermidis produce that helps it adhere to catheters?
    Glacocalyx
  • What infections can Staphylococcus epidermidis cause?
    Endocarditis and bacteremia.
    Sepsis in neonates and peritonitis in patients with renal failure-peritoneal dialysis.
  • How is Staphylococcus epidermidis treated?
    With vancomycin and rifampin
  • Which organism is discussed in this section?
    Staphylococcus epidermidis
  • What color does staphylococcus epidermidis stain in a gram stain?
    Purple
  • What shape are staphylococci bacteria?
    Circular or cocci-shaped
  • How do staphylococci bacteria typically arrange themselves?
    In clusters
  • What does the background color in the video represent?
    Gram-positive characteristic
  • What does the flower vase symbolize in the image?
    Normal skin flora
  • What is the significance of the bison in the image?
    Symbol for novobiosin test
  • What does it mean if staphylococcus epidermidis is novobiosin sensitive?
    It is inhibited by novobiosin
  • What does a zone of clearing around a novobiosin disk indicate?
    Organism is novobiosin sensitive
  • What does the blood on the wall represent?
    Frequent contamination of blood cultures
  • What does the presence of the cat indicate in the image?
    Catalase positive organism
  • What does the catalase test demonstrate?
    Presence of bubbles indicates catalase positive
  • What does the cat urinating symbolize?
    Urease positive organisms
  • What does urease break down urea into?
    Carbon dioxide and ammonia
  • What happens to the pH of the solution if the organism is urease positive?
    It increases, turning the solution pink
  • What does the biofilm on the pipe represent?
    Adherent biofilm produced by staph epidermidis
  • What is the function of the biofilm produced by staph epidermidis?
    Barrier to antibiotics and immune system
  • What does the stick in the bison symbolize?
    Infection of foreign bodies
  • What does staph epidermidis infect?
    Prosthetic devices and IV catheters
  • What does the car in the parking lot represent?
    Endocarditis in prosthetic heart valve patients
  • What is the significance of vancomycin in relation to staph epidermidis?
    It is effective against staph epidermidis
  • What condition is indicated by a fever and cardiac murmur in a patient with a prosthetic valve?
    Prosthetic valve endocarditis
  • What does the growth of coagulase negative staphylococci in blood cultures suggest?
    Presence of staphylococcus epidermidis
  • Why is staphylococcus epidermidis considered coagulase negative?
    It does not produce coagulase
  • What are the key characteristics of staphylococcus epidermidis?
    • Gram-positive
    • Cocci-shaped
    • Forms clusters
    • Part of normal skin flora
    • Novobiosin sensitive
    • Catalase positive
    • Urease positive
    • Produces adherent biofilm
    • Coagulase negative
  • What are the clinical implications of staphylococcus epidermidis infections?
    • Frequent contamination of blood cultures
    • Infection of prosthetic devices
    • Endocarditis in patients with prosthetic heart valves
    • Resistance to antibiotics due to biofilm