Survey: Sanitation 'best medical advance' since 1840

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The development of sanitation has been the greatest medical advance in the last 166 years, according to a vote of more than 11,000 people worldwide.

Sanitation received 15.8% of the votes, beating other advances including the discovery of antibiotics and the development of vaccines.

Inadequate sanitation remains a problem in the developing world, contributing to millions of deaths.

The contest was run by the British Medical Journal.

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