The WHO issued its revised position paper on measles vaccination making “vaccination of all children with two doses of measles vaccine as the standard for all national immunization programmes.” WHO said the second dose can be administered through routine services or given periodically through mass vaccination campaigns to defined age groups. In 2007, WHO estimated that 82% of the world’s children received one dose of measles vaccine by their first birthday and about 197,000 people, mostly children under the age of five, died from measles. “To eliminate measles, countries need to reach at least 95% nationwide coverage with two doses of measles vaccine. To achieve reduction of measles mortality, vaccination coverage should reach at least 90% at the national level and 80% in each district,” WHO said.

WHO position paper on measles vaccine [pdf 724kb]
http://www.who.int/immunization/newsroom/WHO_position_paper_measles/en/index.html