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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.
Description and significance. Vibrio cholerae is a comma shaped Gram-negative1 bacteria with a single, polar flagellum for movement. There are numerous strains of V. cholerae, some of which are pathogenic and some of which are not. The most wide sweeping pathogenic strain is the Vibrio cholerae serotype O1 El Tor N16961 strain that causes the pandemic disease cholera.2 The latest pathogenic serotype O139 was discovered in 1992.