Even as it blocks deliveries of food and other crucial aid, the Syrian government allows the Syrian Arab Red Crescent through its siege lines into rebel-held areas to immunize children against polio. A Syrian Arab Red Crescent volunteer administers polio vaccine to a young girl in the rebel-held Damascus suburb of Yelda. A Syrian Arab Red Crescent volunteer administers polio vaccine to a young girl in the rebel-held Damascus suburb of Yelda. A volunteer of the Syrian Arab Red Crescent speaks gently to a crying child as she tries to administer oral polio vaccine as part of a campaign to extinguish an outbreak of the disease. Children wait to receive oral polio vaccine frm Syrian Arab Red Crescent volunteers in the rebel-held Damascus suburb of Yelda.