Gram-Negative Bacteria (also known as Gram Negative Bacteria): Bacteria which lose crystal violet stain but are stained pink when treated by Gram's method.

NIH MeSH · D006090Organisms

Gram-Negative Bacteria

Also known asGram Negative Bacteria

Definition

Bacteria which lose crystal violet stain but are stained pink when treated by Gram's method.

MeSH classification

  • B03.440

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Related concepts

Abiotrophia

A genus of gram-positive, facultatively anaerobic bacteria in the family Aerococcaceae.

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Acetoanaerobium sticklandii

A species of gram-positive, anaerobic bacteria in the family Filifactoraceae frequently used for the study of ENZYMES.

Acetobacter

A species of gram-negative bacteria of the family ACETOBACTERACEAE found in FLOWERS and FRUIT. Cells are ellipsoidal to rod-shaped and strai…

Acetobacteraceae

A family of gram-negative aerobic bacteria consisting of ellipsoidal to rod-shaped cells that occur singly, in pairs, or in chains.

Acetobacterium

A genus of gram-negative bacteria in the family Eubacteriaceae. Species are homoacetogenic, having the ability to use CARBON DIOXIDE as an e…

Acholeplasma

A genus of gram-negative organisms including saprophytic and parasitic or pathogenic species.

Acholeplasma laidlawii

An organism originally isolated from sewage, manure, humus, and soil, but recently found as a parasite in mammals and birds.

Common questions about Gram-Negative Bacteria

What does Gram-Negative Bacteria mean in medicine?
Bacteria which lose crystal violet stain but are stained pink when treated by Gram's method. This definition is taken from the National Library of Medicine's MeSH (Medical Subject Headings) 2026 release, which is the standard vocabulary used to index PubMed and most medical literature.
Is Gram-Negative Bacteria known by any other names?
Yes. Gram-Negative Bacteria is also referred to as Gram Negative Bacteria in different clinical, research and patient-facing contexts. The MeSH descriptor groups all of these synonyms under a single canonical concept so research and records stay consistent.
Where does Gram-Negative Bacteria sit in the medical classification?
Gram-Negative Bacteria falls under the broader medical category "Organisms" in the MeSH hierarchy (tree numbers: B03.440). Browsing the related concepts on this page takes you to neighbouring topics in the same branch of medicine.
Where can I get a plain-language explanation of Gram-Negative Bacteria?
For a plain-language explanation of Gram-Negative Bacteria - including symptoms, treatments and what it means for an Indian patient - ask GoDavaii's Health AI. It works in 22+ Indian languages, is free and needs no signup. Tap "Ask GoDavaii AI about Gram-Negative Bacteria" above.

Source: NIH MeSH 2026 (D006090) — National Library of Medicine, public domain. View official MeSH record ↗