Discussion
Viridans Streptococci are all, Except?
Answer: D
Correct answer: Found only in the oral cavities as commensals
Viridans streptococci are commensals of the mouth but also of the pharynx, the gastrointestinal tract and the female genital tract, so “only in the oral cavities” is too narrow. The other three statements hold: most are alpha-haemolytic, they are the principal agents of dental caries, and they carry no Lancefield group antigen.
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