Gram + Cocci Tests and Types

Question 1

Staphylococci rxn to novobiocin

Answer 1

• NOvobiocin
  
  • Saprophyticus is Resistant
  • Epidermidis is Sensitive
    
    • “On the office’s ‘staph’ retreat, there was NO StRESs

Question 2

Streptococci rxn to optochin and bacitracin

Answer 2

• Optochin
  
  • Viridans is Resistant
  • Pneumoniae is Sensitive
    
    • “OVRPS” (overpass)
• Bacitracin
  
  • group B strep are Resistant
  • group A strep are Sensitive
    
    • “B-BRAS”

Question 3

Question 4

properties of alpha hemolytic bacteria

Answer 4

• gram + cocci
• partial reduction of hemoglobin causes greenish or brownish color without clearing around growth on blood agar

Question 5

organisms that are alpha hemolytic bacteria and their properties

Answer 5

• Streptococcus pneumoniae
  
  • ​catalase -
  • optochin sensitive
• Viridans streptococci
  
  • catalase -
  • optochin resistant

Question 6

properties of beta hemolytic bacteria

Answer 6

• gram + coci
• complete lysis of RBCs –> clear area surrounding colony on blood agar

Question 7

organisms that are beta hemolytic bacteria and their properties

Answer 7

• Staphylococcus aureus
  
  • catalase +
  • coagulase +
• Streptococcus pyogenes–group A strep
  
  • ​catalase -
  • bacitracin sensitive
• Streptococcus agalactiae–group B strep
  
  • ​catalase -
  • bacitracin resistant