Biology Forum Microbiology my unknown

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    • #11306
      x3chibi
      Participant

      We have no idea what it is because we thought it could be S. aureus or eidermis but we know it’s not.

      gram positive cocci
      catalase positive
      alpha hemolysis
      facultative anaerobe
      mannitol fermenter
      whitish

      Nothing seemed to match all of these.

    • #90526
      Cat
      Participant

      How do you "know" that is is not S. aureus?
      Your findings strongly suggest S. aureus (some stains do have whitish color).

    • #90782
      gakerty
      Participant

      Do you have the means to test for coagulase in your lab? S. aureus will be coagulase (+), S. epidermidis and others will be coagulase (-). You may have access to TGA (Tellurite-Glycine Agar) plates, which differentiate coagulase + (black pigmented colonies) and coagulase – (grayish, or white)although it’s certainly not perfect. By "whitish" in pigment, I’m assuming you have already tested on TGA, or do you mean regular nutrient agar? The latter usually doesn’t tell you much.

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