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(D) The $S$ strain (Smooth strain) of $Streptococcus$ $pneumoniae$ is characterized by the presence of a polysaccharide coat (mucous coat).This polysa

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Both $A$ and $B$

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(D) The $S$ strain (Smooth strain) of $Streptococcus$ $pneumoniae$ is characterized by the presence of a polysaccharide coat (mucous coat).This polysaccharide coat protects the bacteria from the host's immune system,making the $S$ strain virulent (pathogenic),meaning it causes pneumonia.In contrast,the $R$ strain (Rough strain) lacks this coat and is non-virulent.Therefore,the $S$ strain possesses both a polysaccharide coat and virulence.

Which characteristics are possessed by the $S$ strain of $Streptococcus$ $pneumoniae$?

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