gram-negative

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Related to Gram-negative bacterium: Gram positive bacterium

gram-negative

[′gram¦neg·əd·iv]
(microbiology)
Of bacteria, decolorizing and staining with the counterstain when treated with Gram's stain.
References in periodicals archive ?
aeruginosa is a naturally occurring Gram-negative bacterium that causes serious infections in immunocompromised individuals, and is the fourth most common disease-causing pathogen in the hospital.
Now we have also shown in-vivo that it is effective against a very virulent gram-negative bacterium, Pseudomonas aeruginosa.
The results indicate that InSite Vision's AzaSite(TM) anti-infective (1% azithromycin) is effective in treating bacterial keratitis induced by Pseudomonas aeruginosa, a highly virulent gram-negative bacterium.

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