Cholera is a water-borne disease caused by the bacterium Vibrio cholerae. It spreads mainly through contaminated food and water. The famous “story of cholera” refers to the 1854 outbreak in London, where physician John Snow traced the source of the disease to a contaminated public water pump on Broad Street. His work became a landmark in public health and epidemiology, proving that cholera spreads through water rather than “bad air,” and leading to improvements in sanitation. • Follow - @explain