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(medicine, of a bacterium) that is not stained violet by Gram's method
Microscopic image of Gram-negative Pseudomonas aeruginosa bacteria (pink-red rods)
(medicine, of a bacterium) that is not stained violet by Gram's method
Example of a workup algorithm of possible bacterial infection in cases with no specifically requested targets (non-bacteria, mycobacteria etc.), with most common situations and agents seen in a New England setting. Clinically significant Gram-negative bacteria are usually rods, as shown near bottom right. Although some Gram-negative bacteria can be recognized by "bench tests", diagnosis in the modern microbiology lab usually involves MALDI-TOF and/or multitarget assay.