The Health Ministry says that fifty percent institutions and schools within the Colombo City area have mosquito larvae and possible mosquito breeding places.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/half-colombo-dengue-prone
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/island-sri-lanka
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sri-lanka
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/colombo
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/dengue