PMC10328099_01
Gram stain findings of Listeria monocytogenes isolated from blood culture. Numerous chains of Gram-positive rods are visible but are Gram-variable, and some bacilli resemble Gram-negative rods.
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On the same day, the characteristic short Gram-positive rods that occur singly or in short chains were found in the blood culture bottle and L. monocytogenes was identified (Figure 1).