A newly arrived Somali refugee child is held by her mother as she reacts after receiving a measles vaccine at the Ifo extension refugee camp in Dadaab, near the Kenya-Somalia border, August 1, 2011. Aid agencies vaccinate against polio and measles in Kenya's Dadaab area where hundreds of thousands of refugees have settled after fleeing devastating drought and warfare in Somalia. REUTERS/Thomas Mukoya (KENYA - Tags: SOCIETY CIVIL UNREST DISASTER ENVIRONMENT)