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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.
Brandon Tucker. Yersinia pestis is a gram negative, rod-shaped, facultative anaerobic bacterium, known for causing the plague. Y. pestis was first discovered by a French-born Swiss bacteriologist named Alexander Yersin in 1894. Yersin stumbled upon this bacterium while in China studying a plague epidemic there.randon Tucker. Yersinia pestis is a gram negative, rod-shaped, facultative anaerobic bacterium, known for causing the plague. Y. pestis was first discovered by a French-born Swiss bacteriologist named Alexander Yersin in 1894. Yersin stumbled upon this bacterium while in China studying a plague epidemic there.