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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.
It typically lives as individual cells, instead of being associated in clusters or chains. There is also a genus of gram-negative bacteria known as Spirillum, most members of which live in water with a large amount of organic matter, such as stagnant pools.A notable exception is Spirillum minus (S. minus), which is one of the two types of bacteria that can cause rat-bite fever.Most types of bacteria possess flagella, or whip-like appendages, that help them to move through solutions. Bacteria from this genus have unusual types of flagella.t typically lives as individual cells, instead of being associated in clusters or chains. There is also a genus of gram-negative bacteria known as Spirillum, most members of which live in water with a large amount of organic matter, such as stagnant pools.