Only 8% of homes in rural Poland, for example, have any kind of sewerage system.
Only 18% of the population have piped water and only 2.5% are connected to a sewerage system.
In north-east Brazil, too, a sewerage system combining cheaper technology and community involvement has proved a runaway success.
Dr Heymann speculated the virus could be excreted with body fluids, and spread via the sewerage system, or through water.
For the first time, the village has its own sewerage system and natural gas piped into the houses for cooking.
This is an area which lacks basic facilities e.g. toilets, clean water, drainage and sewerage system and other social problems.
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Speaking in the debate, Andrew Slaughter, Labour MP for Hammersmith, said there was a "real need" for improvements to London's sewerage system.
One delegate, for example, told the conference of a wetland south of Kampala, Uganda's capital, that works as the city's sewerage system.
When officials in this bucolic town say they don't have a sewerage system, you get the sense they don't really want one either.
Some Mexicans question his handling of the city's finances: they claim that he robbed the sewerage system of investment in order to pay for popular handouts to over-70s.
That isn't being done within the sewerage system at present.
BBC: NEWS | Programmes | File on 4 | Neglected sewers threaten floods
Following the incident, Laura Sandys, Conservative MP for South Thanet, said the sewerage system was not "fit for purpose" and she would be meeting Southern Water and Thanet District Council.
Ofwat's chief engineer, Bill Emery, insisted there was no crisis in the sewerage network but said a monitoring system had been put in place to forewarn of collapsing sewers.
BBC: NEWS | Programmes | File on 4 | Neglected sewers threaten floods
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