A security official escorts the health workers as they administer polio vaccination to children

KOHAT: A Pakistani security official escorts the health workers as they administer polio vaccination to children in kohat 2nd campaign in villages. Pakistani authorities are now providing health workers with security after at least nine anti-polio workers, including six women, were killed in a string of gun attacks across Pakistan in December 2012 against teams working on a UN-backed program to eradicate polio.—Agencies