Has anyone seen this morphology before?

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Karen A. Darbinyan Popular answer

Hello, only with provided picture do not possible to come to the final resolution, If it bacteria looks like Bacillus mycoides.

Karen A. Darbinyan

Matteo Bisi

Hello, wich kind of solid culture medium are you using? If you want to exclude any kind of fungi there is a simple trick: do a Gram staining on one colony sample and pick up another single colony by simply touching it with a little piece of adhesive and transparent tape (or just use a sterile loop to transfer it on the tape if don't want to comìnatminate your sample), then put the tape on a microscopic slide. Then observe both by using an optical microscope at 40x magnification: yeasts will appear as big blue an round cells (Candida spp or Saccharomyces spp do so) in the stained sample, molds on the tape (but judjing by your image i don't think that it is the case) will show their tipical structure. I know thath Gram staining is used for bacteria classification, but can come handy for yeasts that may grow on a simple medium (like TSA or PCA or Mueller Hinton) and be confused as bacteria. Hope it will help

Jorji Siegmundt

Thanks so much. This one was on minimal mucin media. It's from a stool culture.

I was trying to google pictures of bacteria colony morphology, but I wasn't sure how to classify this to get to the pictures I'm looking for.

Huda Waleed Hadi

If the image was examined under 40-magnification power, it is normal to have a fungus,

But if the magnification force is 100, then the bacteria cells are very accurate

While fungal cells are huge under this force

And since you used a stool sample, be sure that you took the swab from the growing colony, and not the impurities, the possibility that it was undigested food.