Gram-positive

Thick-walled bacterial type

Gram-positive describes bacteria that retain a violet dye in a laboratory staining technique developed by Hans Christian Gram.

These bacteria have thick cell walls that trap the stain, appearing purple under a microscope.

Many common infections involve gram-positive bacteria, including staph and strep: The lab identified Gram-positive organisms.

The classification helps determine which antibiotics will be effective. (Also written gram-positive.)

antibiotics

vancomycin

Glycopeptide antibiotic for resistant infections

clindamycin · cephalexin · erythromycin · azithromycin · MRSA

bacteria

Clostridium

facultative · probiotic · commensal · pathogen

infections

cellulitis

Subcutaneous bacterial infection

impetigo · erysipelas · osteomyelitis · meningitis · pharyngitis · toxic shock syndrome · diphtheria · tetanus · botulism · anthrax

staining

purple

Hue between crimson and azure

decolorizer · microscopy · retention · smear · fixation

structure

cell wall

Rigid cellular outer layer

Categories
Opposites
Gram stain classification

Gram-positiveGram-negative

Bacteria rejecting primary stain

Family

positive, Gram-negative

Familiarity
Top 1,000,000
Profile
Used worldwide · Timeless · Rated G