Airline without a vaccination mandate for employees. the world health organization is hailing what it calls a breakthrough against disease that's been stalking africa. it has been given the go ahead, the first malaria vaccine which will be used in children. malaria has been home in africa to the most malaria cases. the most vulnerable are children under 5. they account for more than a quarter million deaths in africa alone every year, and the vaccine is only 30% effective against severe disease and death. officials say it is still a big step forward. >> we still have a very long road to trav...