RE: Name that organism!
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Proteus, Morganella and Providencia Group.
Not sure if it will appear the textbook swarming if given more time to grow or that is already a swarming growth pattern so I'm leaning on to Proteus mirabilis.
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Proteus is beige on CHROMagar.
Take a step back and read the clues again.
My first guess before E. faecalis was S. bovis
Buzz words like landlocked made me weirdly associate it to the word "cattle", there's no rationale why it just is. It's the same feeling when someone mentions penicillin and I think of oranges but never the other way around.
Then the word saline which is used at 6.5% NaCl growth to test between Enterococcus spp and S. bovis. This is all not factoring in CHROMagar. I'll read on it further.
S. bovis is also blue on the agar, but they have a different appearance compared to Enterococcus.
The organism in question is gram negative.
Yersinia enterolitica
Nope.
Yersinia pestis
Am I even getting close?
No. Colder.
Think waterborne.
Ok, before even coming up with Yersinia enterolitica, there was Aeromonas hydrophila but stool cultures and landlocked buzzwords made me not mention it first not being a common uropathogen.
Unfortunately, it's not Aeromonas, but that is more in line with stool, waterborne, etc.
Now, try salt water instead of fresh water.
V. parahaemolyticus or V. vulnificus
Correct genus!
I thought of Vibrio cholerae before resorting to parahaemolyticus or vulnificus.
Few more comments into the future of getting this possibly wrong would have me guessing V. mimicus or V. alginolyticus just to cross off some list under the Vibrio genus.
And V. cholerae is the correct answer.
I have never seen what it looks like on the CHROMagar before this case.
This was fun, got me reading more about CHROMagar. I'm focused on the surgicopath side of things so subjects like microbio, clinical chem, and hematology will be a new exposure as my rotations were shifted recently.
Glad you enjoyed it.