[Daily Mail, where America gets its news] - The virus was detected at the Beckton sewage treatment works, which covers a population of four million in north and east London
- Great Britain was pronounced clear of polio in 2003 with last case found in 1984
- Now the NHS are launching a campaign to contain the disease by contacting the parents of unvaccinated children after health chiefs declared a national incident
- The UK's health service is starting up a major drive of children's polio vaccines
It is likely they then infected relatives by failing to wash their hands properly and contaminating food and drink. Officials are looking at the possibility that just one family – or an extended family – may be affected.