John Snow believed Idear 2 was right .How did he finally prove it?

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JohnSnowbelievedIdear2wasright.Howdidhefinallyproveit?JohnSnowbelievedIdear2wasright.Howdidhefinally

John Snow believed Idear 2 was right .How did he finally prove it?
John Snow believed Idear 2 was right .How did he finally prove it?

John Snow believed Idear 2 was right .How did he finally prove it?
John Snow finally proved his idea because he found an outbreak that was clearly related to cholera, collected information and was able to tie cases outside the area to the polluted water.