Difference between S. pneumoniae and Viridans Streptococci

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S.N. Characteristics S. pneumoniae Viridans Streptococci
1. Morphology Lanceolate diplococci Oval or round cells in chain
2. Capsule Capsulated Non-capsulated
3. Quellung Test Positive Negative
4. Bile solubility Bile soluble Bile insoluble
5. Inulin fermentation Positive Negative
6. Optochin sensitivity Sensitive Resistant
7. Pathogenicity in mice Pathogenic Non-pathogenic
8. Hemolysis Alpha-hemolytic (under aerobic conditions) or Beta-hemolytic (under anaerobic conditions) Alpha hemolytic or non-hemolytic
9. Pathogenesis Causes pneumonia Causes mainly oral infections

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