PMC8052168_01
Macroscopic and microscopic appearance of Brevibacterium casei. (a) Gram-stained smears from blood samples cultured in bottles at 37 C for 24 h. (b) Macroscopic appearance of B. casei colonies after isolation from the patient and culture on a sheep blood agar plate incubated at 37 C for 24 h in a CO2 atmosphere. (c) The colonies appeared gray-white in color, non-hemolytic, smooth, and round and had a distinctive cheese odor.
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fig1
After a 24 h incubation at 37 C in a CO2 atmosphere, the Gram-positive rods formed colonies on sheep blood agar that were whitish to gray-white in color, non-hemolytic, smooth, and round and had a distinctive cheese odor (Figure 1).