Streptococcus
Streptococcus INTRODUCTION: Gram +ve cocci Arrangement in chains or pairs Phylum Firmicutes and the order Lactobacillales (lactic acid bacteria). Most are oxidase-negative and catalase-negative, and many are facultative anaerobes. Cell division along a single axis in these bacteria CLASSIFICATION: Brown’s classification Lancefield grouping Griffith typing Brown’s classification: 1.α- hemolitic( green) Streptococcus pneumoniae( optochin sensitive, bile soluble, capsule=>quellung+) Streptococcus viridans(mutans,sanguis optochin resistant,no capsule, bile insoluble) 2.β- hemolitic(clear) […]
