<unk>  are those<unk>  that do not retain crystal violet dye in the<unk>  staining protocol.<unk> -positive<unk>  will retain the crystal violet dye when washed in a decolorizing solution. In a<unk>  stain test, a counterstain (commonly safranin) is added after the crystal violet, coloring all<unk>  a red or pink color. The test itself is useful in classifying two distinct types of<unk>  based on structural differences in their cell walls.
Many species of<unk>  are pathogenic, meaning they can cause disease in a host organism. This pathogenic capability is usually associated with certain components of<unk><unk>  cell walls, in particular the lipopolysaccharide (also known as LPS or endotoxin) layer. In humans, LPS triggers an innate immune response characterized by cytokine production and immune system activation. Inflammation is a common result of cytokine production, which can also produce host toxicity.
Gram-negative bacteria
Cancer bacteria
Gram-positive
Aerobic organism
RNA virus
Spore
Double-stranded RNA viruses
Acid-fast