A microbiologist gram stains a bacterium and finds the bacterium to be blue to purple in color,this identifies:

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The blue to purple staining indicates that the bacterium has a thick peptidoglycan layer in its cell wall which is characteristic of gram positive bacteria. Gram negative bacteria on the other hand have a thinner peptidoglycan layer and would appear pink to red in color after a gram staining procedure. The species of the bacterium or whether it causes human disease cannot be determined solely from the gram staining result.

A Microbiologist Gram Stains a Bacterium and Finds the Bacterium