The Philippines is reporting its first case of polio since 2001, with a three-year-old girl in a southern province contracting the virus.
Health authorities say the virus has also been detected in Manila's sewage and in waterways of the large southern city of Davao.
A World Health Organisation (WHO) representative says they are concerned more people will be exposed to the virus.
Polio is a highly infectious disease which can lead to paralysis or even death and has no cure, but a vaccination is available.