Drug in vaccine that killed Syrian children has been identified, says WHO Fifteen children died in northern Syria due to the incorrect use of a drug in a measles vaccine, according to the World Health Organization, WHO. The children from Syria's Idlib province received the contaminated measles vaccination as part of a UN immunization campaign in September. A WHO investigation revealed that the vaccine was incorrectly reconstituted with a muscle relaxant drug. Ampoules of the drug were mistakenly added to vaccination packs prepared in a distribution centre in Idlib province. It was then supplied to four health teams on the second day of the measles campaign. WHO called the incident a "tragic event." It is urging health partners to rebuild confidence in vaccination programmes and ensure that all children have access to life saving immunizations. SOURCE: Daniel Dickinson, United Nations.