Class Alphaproteobacteria

agrobacterium

gram-, bacillus, plant pathogen, causes tumors in plants

bartonella

gram-, pleomorphic, flagellated coccobacillus, transmitted by lice and fleas, causes trench fever and cat scratch disease, facultative intracellular bacteria

brucella

gram-, small, flagellated coccobacillus, facultative intracellular bacteria, transmitted by contaminated milk from infected cows, causes brucella in humans and cattle

caulobacter

gram-, bacillus, used in cellular adaptation studies and differentiation, during cell division it forms swarm cells and stalked cells

ehrlichia

very small gram-, obligatory intracellular bacteria, coccid or oval, transported from cell to cell, transmitted by ticks, destroys WBCs and inflammation in humans and dogs

hyphomicrobium

gram- bacilli, grows from a stalk, used in cellular adaptation studies and differentiation, during cell division it forms swarm cells and stalked cells

methylocystis

gram-, coccid or short bacilli, nitrogen-fixing aerobic bacteria

rhizobium

gram-, rectangular bacilli with rounded ends forming clusters, nitrogen-fixing, live in soil, form symbiotic relationship with legume roots

rickettsia

gram-, highly pleomorphic, obligate intracellular bacteria, transmitted by ticks, may cause Rocky Mountain spotted fever and typhus