Streptococcus Flashcards
Strep Basics
G+ Cocci in chains, catalase negative, sensitive to heat, drying, high salt, and most to penicillin
Strep vs Staph
both G+ cocci,
Strep=catalase negative
Strep=susceptible to salt, drying, and penicillin
can prescribe penicillin
most strains of strep, not for staph tho
strep vs staph Coag + or -
strep=coag -
staph=coag +
oxygen requirement of staph and strep
strep=fermenter
staph=facultative anerobe
Classification methods for Strep
- Biochemical/DNA
- Hemolytic Pattern on blood agar
- Group specific antigens (lancefeild)
Lancefield Classification
group specific antigens
Beta Hemolytic Streps
more virulent, more hemolytic
- S. pyogenes
- S. agalactiae
Alpha hemolytic streo
somewhat hemolytic/virulent
1. S. pneumonia
Gamma Hemolytic
No hemolyisi
1. includes the group called Viridans group which includes S. mutans which is alpha
hemolytic classification of S. Mutans
in Viridians group, but alpha
Viridians Group
Group of strep which fall into alpha and gamma hemolytic classfication; many oral bacteria
Lancefield Classification
Rebecca Lancefield; based on difference in surface antigen called cell wall C Carbohydrate; which can be used to classify bacteria into serotypes
Serotypes
differentiated by the cell wall C Bacteria surface antigen the bacteria carry; each has a unique antigen; detect using antibody/serum; can even use to differentiate between strains
differentiate between strains
can use serotyping
