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In Egypt, wild poliovirus type 1 (WPV1) was isolated from sewage samples collected on 2 and 6 December 2012 in two areas of greater Cairo. Virus has been detected in sewage only; no case of paralytic polio has been reported. Genetic sequencing shows that the virus strains are closely related to virus from northern Sindh, Pakistan. Pakistan is one of three countries worldwide affected by ongoing indigenous transmission of WPV (together with Nigeria and Afghanistan). The isolates were detected through routine environmental surveillance in Egypt that involves regular testing of sewage water from multiple sites.
(Via WHO Global Polio Eradication - accessed 16/07/13)
