Karachi is among those densely populated cities of the Third World, where epidemic of diarrhoea has taken a chronic shape due to non-provision of clean drinking water.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/diarrhoea-takes-chronic-shape-karachi
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-recorder-pakistan
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pakistan
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/karachi
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diarrhoea
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/epidemics