"We ask negotiating parties to the Syrian conflict that will gather in Geneva: allow us access to the besieged areas; we need to do 3-4 vaccinating campaigns reaching 2.3 million children," Elizabeth Hoff said at a press conference.
A WHO polio immunization campaign in Syria in October, which was due to reach 500,000 children, was prevented from doing so when obstacles were put in its way by parties to the conflict, the UN agency asserted in its Regional Situation Report, released in October.
In the report, WHO said it had provided technical assistance to prepare and implement a polio campaign in Syria to reach 2.3 million children under 5 years.
Syria has been in a state of civil war since 2011, with government forces fighting anti-government rebels as well as extremist groups. More than 13 million people have been internally displaced by the war, while over four million Syrians are living in neighboring countries, including Turkey, Lebanon, Jordan, Iraq and Egypt.