Girls walk with water containers past a puddle of sewage water from collapsed underground pipes in Khan Younis in Gaza. Polio has been detected in samples taken from sewage in the enclave. AFP
Girls walk with water containers past a puddle of sewage water from collapsed underground pipes in Khan Younis in Gaza. Polio has been detected in samples taken from sewage in the enclave. AFP

Thousands at risk as traces of polio detected in Gaza's sewage