All Streptococci are catalase (-). They are differentiated by sensitivity to optochin (S. pneumoniae sensitive, Viridans resistant) and bacitracin (S. pyogenes sensitive, S. agalactiae resistant), as well as growth in 6.5% NaCl (E. faecalis +, S. bovis -).
Todos los estreptococos son catalasa (-). Se diferencian por la sensibilidad a optoquina (S. pneumoniae sensible, Viridans resistente) y bacitracina (S. pyogenes sensible, S. agalactiae resistente), así como por el crecimiento en 6.5% de NaCl (E. faecalis + , S. bovis -).
| 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% (-) |
Tags: microbiology
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