More people living in less space can put greater strain on already limited sanitation resources, and this can create a fertile breeding ground for waterborne infectious disease and the insects spreading them.
This is an industry that doesn't have the common cold... It has cholera.
I'm a little thirsty, can I go drink out of your toilet?
Typhoid and swans - it all comes from the same place.
My secret is one the world needs to know - nearly a billion people a year die from unsafe drinking water.
If anything, all homes should have piped water supply and sanitation, which could improve public-health indicators and reduce infant mortality.
Contaminated food is a major cause of diarrhea, substantially contributing to malnutrition and killing about 2.2 million people each year, most of them children.
