It is spread through infected faeces and, once it enters the water supply, it is difficult to stop - especially in a country like Haiti which has almost no effective sewage disposal systems.

BBC: UN launches appeal to fight Haiti cholera epidemic

The design allows for passive solar heating in the winter, has a metal roof for rainwater collection and uses an incinerating toilet to minimize water usage and avoid the need for sewage disposal, said Carrie Caverly, an architectural designer.

CNN: Tiny homes hit the big city

"The outbreak is likely to continue as the water and sanitation situation is worsening, with severe shortages of potable water, sewage and waste disposal problems reported in most of the populated areas, " the statement said.

CNN: Cholera kills 300 in battered Zimbabwe

The disposal of raw, untreated sewage on farmland in Scotland has led to fears that dangerous viruses may be lurking in the soil or finding their way into the water supply.

BBC: Special Report