Question

All Streptococci organisms are catalase (-)How do you differentiate various species?

Accepted Answer

S.pneumonia → Optochin sensitiveViridans Group → Optochin resistantS.pyogenes (GAS) → Bacitracin sensitiveS.agalactiae (GBS) → Bacitracin resistantE.faecalis → Growth in 6.5% (+)S.bovis → Growth in 6.5% (-)

Text	All *Streptococci* organisms are catalase (-) How do you differentiate various species?
Extra	S.pneumonia → Optochin sensitive Viridans Group → Optochin resistant S.pyogenes (GAS) → Bacitracin sensitive S.agalactiae (GBS) → Bacitracin resistant E.faecalis → Growth in 6.5% (+) S.bovis → Growth in 6.5% (-)

Optochin Sensitive Resistant Bacitracin Growth Streptococci Organisms Catalase