||Caption: Rumen bacterium (Prevotella ruminicola). Prevotella ruminicola (also known as Bacteroides ruminicola or Bacteroides melaninogenicus) is a Gram-negative, non-motile, rod-shaped, anaerobic bacterium (prokaryote) that thrive in anaerobic (no oxygen) growth conditions. P. ruminicola is commonly found in the rumen and hindgut of cattle and sheep. This bacterium helps breakdown protein and carbohydrate food sources. P. ruminicola is used to prevent the bovine disease called rumen acidosis. Rumen acidosis greatly affects milk production of cattle by disrupting the typical digestive processes of the bovine stomach. Prevotella species are also present in humans, where they can be opportunistic pathogens. Prevotella intermedia is a human pathogen known for creating periodontal and tooth problems. Prevotella species have been studied in order to counteract its pathogenesis. Prevotella ruminicola and Prevotella intermedia have had their genomes completely sequenced and this has lead to an increased ability to fight Prevotella pathogenic capabilities.