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Which of the following cocci is a part of normal flora of the mouth?

  • A.Streptococcus agalactiae
  • B.Staphylococcus saprophyticus
  • C.Staphylococcus epidermidis
  • D.Streptococcus mutans

Answer: D

Correct answer: Streptococcus mutans

S. mutans is a viridans streptococcus and a normal inhabitant of the mouth, colonising the tooth surface and becoming pathogenic only when a sucrose-rich diet lets it produce the glucan and acid of dental caries. The staphylococci listed are skin flora, and S. agalactiae belongs to the genital and gastrointestinal tract.

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