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Spirillum. a genus of gram-negative, spiral, and curved bacteria, including one species, S. miÂ´nus, that is pathogenic for guinea pigs, rats, mice, and monkeys and is the cause of rat-bite fever in humans.piÂ·rilÂ·la. A member of the genus Spirillum. /SpiÂ·rilÂ·lum/ (spi-rilÂ´um) a genus of gram-negative bacteria. The species S. miÂ´nus is pathogenic for guinea pigs, rats, mice, and monkeys and is the cause of rat-bite fever (sodoku) in humans.
Because Spirillum bacteria are large spirilla, they have the typical spirilla flagella long wavelength of over 3 micrometers and usually less than one full wave (this is in contrast to at least one large spirillum and those of medium or small diameter have flagella with several waves and a short wavelength).ell Structure and Metabolism. Spirillum bacteria are large chemotrophic spirilla 1.4 to 1.7 micrometers in diameter and up to 60 micrometers in length, with anywhere from less than one to five helical turns.