The WHO and UNICEF will send a joint team to Gaza to begin collecting samples, with clear recommendations expected within the coming days on how to address the threat, including a potential mass vaccination campaign, AFP reports.

UN agencies said last week that poliovirus had been detected in samples collected from sewage in Deir el-Balah and Khan Younis in the Gaza Strip.

No samples have been taken from humans yet, so it remains unclear if anyone in the Palestinian territory has been infected.