莱姆病是由鹿蜱传播给人类的一种细菌引起的。
Lyme disease is caused by a bacterium transmitted to humans by deer ticks.
霍乱是一种由细菌引起的感染。
最近，医生们发现胃溃疡不是由压力、酒精或油腻的食物引起的，而是由一种存在于胃粘膜内壁的细菌引起的。
Recently physicians have determined that stomach ulcers are not caused by stress, alcohol, or rich foods, but a bacterium that dwells in the mucous lining of the stomach.
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