Streptococcus and Related Genera Flashcards
What is the catalase reaction for Staphylococcus?
Positive
What is the catalase reaction for streptococcus?
Negative
What tests should be set up for Beta streptococci?
PYR, Bile esculin, NaCl, CAMP, bacitracin (Catalase)
What tests should you set up for Alpha/Gamma Streptococci?
PYR, Bile esculin, NaCl, Optochin (Catalase)
What organism is bacitracin susceptible? *
Group A
What organism is optochin susceptible? *
Streptococcus Pneumoniae
What organisms are PYR positive? *
Group A and Enterococcus
Which organism is bile solubility positive? *
Streptococcus Pneumoniae
What is a positive CAMP and what organism produces this? *
Arrowhead of hemolysis; Group B
What is a positive bile esculin and what organisms produce this? *
Growth and black ppt. Enterococcus or Group D
IF you can not set up a bacitracin, what is an alternative?
PYR
IF you can not set up a optochin, what is an alternative?
Bile solubility
What group usually has a large zone of Beta hemolysis?
Group A
What group usually has a small zone of Beta hemolysis?
Group B
What bacteria has a mucoid and dipped appearance?
Streptococcus pneumoniae
How do O and S streptomycin act with oxygen?
O labile and S stable
What organisms are catalase positive?
Staphylococcus
What organisms are catalase negative?
Streptococci
What organism is weakly catalase positive?
Enterococcus
What organisms are LAP positive? *
ALL Streptococci and Enterococci
What two organisms are Esulin positive? *
Group D and Enterococcus
What organism is NaCl positive? *
Enterococcus; Group B is variable
What organism is PYR positive? *
Group A and Enterococcs
What organism is Optochin susceptible? *
Streptococcus pneumoniae
What organism is bile soluble positive? *
Streptococcus Pneumoniae
What organism is Quelling positive?
Sreptococcus Pnemoniae
What Organisms are bacitracin susceptible? *
Group A
What bacteria is CAMP positive? *
Group B
What bacteria is sodium hippurate positive?
Group B
What bacteria is Co-aggulation positive (in class)? *
Group B
What are characteristics and positive results for Group A?
Beta hemolysis, PYR +, Bacitracin = S,
What are characteristics and positive results for Group B?
Beta hemolysis, CAMP +, NaHippurate +, NaCl (usually)
What are the characteristics and results of Group D?
Alpha or gamma, Esculin +, NaCl and PYR negative
What are the characteristics and + results for Streptococcs pneumonia?
Alpha hemolytic, Optochin susceptible, Bile solubility positive, and Quelling test +
What are enterococcus characteristics and + results?
Alpha/Gamma, Esulin, NaCl, PYR positive
What are alpha streptococcus (not group D) test results?
Negative for alpha strep differentiation
What are beta streptococcus (not group A, B, or D) test results?
Negative for beta strep differentiation
How does lancefield grouping work, what bacteria is it used with mostly?
Ag reacted with specific Ab. Beta Streptococci
What strep grows on SBA with SXT?
Group A
What does it mean to be highly specific and low sensitivity?
If + than it IS +, hard to detect (takes a lot of organism)
