∞ generated and posted on 2016.02.16 ∞
Group of Gram-negative bacteria that includes a number of important human pathogens such as members of family Enterobacteriaceae, members of genus Rickettsia, members of genus Helicobacter, members of genus Vibrio, etc.
The proteobacteria are further subdivided into the alpha (α), beta (β), gamma (γ), delta (δ), epsilon (ε), and zeta (ζ) proteobacteria.