How to identify Proteus

Dilworth dilworth at
Tue Jun 27 00:45:36 EST 2000

You are correct, John.  We used to use a similar setup on specimens other than
stools.  With stools, all one needs to know is that the lactose negative organism
IS NOT Salmonella or Shigella, hence the TSI, LIA, SIM and Urea.   Sorry I wasn't

Judy Dilworth, M.T. (ASCP)

Yjgent wrote:

> If you use any kind of blood agar most Proteus will swarm all over the plate
> and any other organisms that are there. It also has a unique odor that is only
> associated with Proteus.
> A proper ID of Proteus needs at a minimum:
> Non-lactose colony on MacConkey's or EMB agar,
> TSI = Alkaline slant, acid butt, Gas +, H2S+,
> Urea = +
> Motiltiy = +
> Ornithine + and Indole - = Proteus mirabilis
> Ornithine - and Indole + = Proteus vulgaris
> Ornithine + and Indole + = Proteus penneri

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