The process of cumulative change over successive generations through which organisms acquire their distinguishing morphological and physiological characteristics.
Evolution, Biological
D006090
Gram-Negative Bacteria
Bacteria which lose crystal violet stain but are stained pink when treated by Gram's method.
Gram Negative Bacteria
D014774
Virulence
The degree of pathogenicity within a group or species of microorganisms or viruses as indicated by case fatality rates and/or the ability of the organism to invade the tissues of the host. The pathogenic capacity of an organism is determined by its VIRULENCE FACTORS.