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Globally, an estimated 2.5 billion people lack access to improved sanitation.
There is a new shift in political interest in sanitation in India with the newly launched Swacha Bharat Abhiyan on 2 October 2014.
Household water treatment (HWTS) methods, such as boiling or chlorination, have long been recommended in emergencies.
When the Asian tsunami struck the Andaman Islands, nearly 7,000 people were relocated in six camps.