The World Health Organization (WHO) said on Wednesday that a mass campaign to vaccinate children against polio in Gaza would resume on Saturday, with over half a million children targeted.
"The current environment in Gaza, including overcrowding in shelters and severely damaged water, sanitation and hygiene infrastructure, which facilitates fecal-oral transmission, create ideal conditions for further spread of poliovirus," the WHO statement said.
"Extensive population movement consequent to the current ceasefire is likely to exacerbate the spread of poliovirus infection," it added.
In September and October last year WHO conducted two rounds of vaccinations across the enclave, reaching over 95 per cent of the target.
The virus is still circulating in the enclave, meaning it could still reach a child who is under or un-immunized. Six samples tested positive in December and January, WHO added.
Though access for health workers has improved since the ceasefire came into place on January 19, some areas could not be accessed due to the fighting at the time. 7,000 children missed vaccination in Jabalia, Beit Lahiya, and Beit Hanoun, according to the organisation.

Trump touts $5,000 payout if Republicans win as Vance waits in wings
Search expands after Philippine ferry fire kills five and leaves dozens missing
Trump says Iran war to end after US midterm elections
At least 20 killed in cargo vessel fire at China shipyard, state media reports
US military says it struck vessel in Caribbean, killing 3
At least 14 killed in explosion at weapons depot in Syria
US hits five Iranian oil tankers after attack on Navy ships
UK gives air traffic provider a week to probe outage that halted flights
