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Purpose. The 2014 outbreak of Ebola virus disease (EVD) in West Africa was the largest in history.
The devastating earthquake of 2005 severely damaged over 4000 water and sanitation schemes in northern Pakistan.
After a series of earthquakes devastated Port-au-Prince, Haiti, on 12 January 2010, safe excreta disposal became an urgent priority.
In peri-urban Monrovia, contaminated hand-dug wells were contributing to cholera outbreaks.