Vibrios. Vibrios are curved, Gram-negative, facultatively anaerobic rods. They belong to the family Vibrionaceae. One species, Vibrio cholerae , is the cause of cholera in humans. Members of the genus Aeromonas and Plesiomonas are involved in human intestinal disease. Species of Photobacterium are marine organisms known for their ability to produce light as a result of chemical actions stimulated by the enzyme luciferase. This production of light is known as bioluminescence. Pasteurellas. The pasteurellas belong to the family Pasteurellaceae. They are distinguished from vibrios and enterobacteria by their small size and inability to move. The genera Pasteurella, Haemophilus , and Actinobacillus are among the important members of the group. The species H. influenzae is a cause of meningitis in children, while P. multocida causes cholera in fowl.
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