Streptococcus genus is a Gram-positive bacteria, the main habitat is the animal oral and respiratory tract, its physiological characteristics and the physiology of the genus of the tablets are mostly similar, belong to the heterotrophic microorganisms, fermenting sugar does not produce gas. Streptococcus genus contains 29 species such as Hanschedoccus, polymorphic streptococcus, and short streptococcus
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