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Lab 8 Organisms

Organisms introduced/further discussed in this lab

Expected results:

Staphylococcus aureus

  • Growth on MSA, ferments mannitol causing a color change to yellow,
  • b-Hemolysis on BAP
  • coagulase positive (plasma will form a clot in the tube)

Staphylococcus epidermidis

  • Growth on MSA, does not ferment mannitol (medium remains red)
  • g-Hemolysis on BAP
  • coagulase negative (plasma will remain fluid)

Streptococcus pneumoniae

  • Limited or no growth on MSA
  • a-Hemolysis on BAP

Streptococcus pyogenes

  • Limited or no growth on MSA
  • b-Hemolysis on BAP

Other organisms mentioned:

  • Staphylococcus saprophyticus
  • Micrococcus luteus
  • Streptococcus agalactiae
  • Streptococcus mutans
  • Streptococcus mitis
  • Enterococcus faecalis
  • Enterococcus faecium

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