By the start of 20th century the countries across the world had been affected by many major cholera pandemics. Now the world is fighting the seventh new strain of bacteria known as Vibro cholera. The main source of cholera infection is contaminated water supplies and sometimes raw shellfish, uncooked fruits, vegetables, and many other foods also can consist of cholera bacteria.

The Vibrio cholera bacterium has two life cycles one in the environment and one in humans. Mostly the sources including cholera infection are surface of well water, sea food, raw fruits and vegetables, and grains. Cholera bacteria can lie dormant in water for a long period.

The epidemic mostly occurs in communities where there is inadequate sanitation. And the areas affected by natural disasters or war are especially at risk of cholera. Eating raw or uncooked sea food that originates from certain location can cause cholera. So it is advisable to have hygiene food and water.