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n. pl. pro·te·o·bac·te·ri·a (-tîr′ē-ə)
Any of numerous gram-negative bacteria of the phylum Proteobacteria, including E. coli, the agrobacteria, many nitrogen-fixing bacteria, and many pathogens, such as salmonella.

[New Latin prōteobactērium, back-formed singular of Prōteobactēria, phylum name : Greek Prōteus, Proteus (the great morphological, metabolic, and ecological diversity of the phylum being likened to the god's shape-shifting powers) + New Latin bactērium, bacterium; see bacterium.]
References in periodicals archive ?
1] The causative organism is Orientia tsutsugamushi, a gram negative alpha proteobacterium.
gamma]- piscicida proteobacteria h 48 M2a 94 Thalassobius gelatinovorus M2c 93 Planktotalea frisia [alpha]- proteobacteria M2d 98 Ruegeria lacuscaerulensis [alpha]- proteobacteria M2h 99 Unidentified alpha proteobacterium M2i 99 Uncultured bacterium clone Alibio h 0 A1a 90 Wandonia haliotis Haldis Flavobacteria A1c 90 Cytophaga fermentans Cytophagaceae A1d 90 Sebaldella termitidis A4a 90 Wandonia haliotis Haldis Flavobacteria A4b 90 Cytophaga fermentans Cytophagaceae A4c 96 Photobacterium damselae subsp.
bacilliformis, an a-2 proteobacterium, may cause a life-threatening bacterial infection (1,2).