概括一下John snow defeats “king cholera”

The main idea of this passage is that John Snow found out the cause of the disease called colera which was a deadly disease in London in the 19th century. With Snow's great efforts, the disease was finally under control.

一句话概括：有名医生John Snow 是如何通过考察、分析和探究的科学方法，发现并控制“霍乱”这种传染疾病的。
简介：John Snow 是伦敦有名的医生，而那时霍乱是最致命的疾病。其致病原因和治疗手段都尚不明确。每次疫情暴发都有上千的人们死亡。当时，解释霍乱是如何导致人们死亡的说法有两种。John Snow 比较认同疾病是随餐进入人体的，但他缺乏证据。当疾病迅速蔓延到他可怜的邻居时，他开始着手收集这些信息。他在地图上标出死去人们曾居住的地方。这幅图为疾病的起因提供了重要的线索。Broad街的管道流出的水貌似有问题。更重要的发现是这水来自被伦敦污染后的河流。在调查了另外两个事件后，John Snow明确宣布被污染的河流就是传播疾病的元凶，并建议检测所有的水源供给。最终霍乱被打败了。

是概括课文大意吗John Snow, a famous doctor and expert, succeeded in defeating King Cholera in a scientific way. Cholera was a deadly disease and had attacked London twice in the 1850s.