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In the early to mid-19th century, cholera ravaged England, killing thousands of people. The prevailing scientific theory at the time was that the disease was spread by dirty air. But a British doctor named John Snow suspected that the mysterious disease, which killed its victims within days after their complaints [of|in|for|from|to] the first symptoms, was connected to London's drinking water. However, if a good doctor treated patients [of|in|for|from|to] the disease, some people could recover [of|in|for|from|to] it.

Snow examined hospital records and morgue reports to find out which places were involved [of|in|for|from|to] deadly outbreaks. He created a geographic map of cholera deaths over a 10-day period and found a cluster of 500 fatal infections surrounding the Broad Street pump, a popular drinking water well in the city.

Snow convinced local officials to remove the pump handle from the Broad Street drinking water well and after some time the infections disappeared. Snow's work didn't cure cholera overnight, but it eventually led to a global effort to improve city sanitation and protect drinking water from contamination.