Malaria Vaccine Has Promising Test Results LONDON - Scientists have made important progress in the quest for a malaria vaccine, showing for the first time that childhood shots can prevent nearly one-third of cases and slash the risk of severe, life-threatening attacks by almost two-thirds.    Experts say the findings, outlined this week in The Lancet medical journal, provide robust evidence that the dream of developing a vaccine that will get babies through the most vulnerable period of infancy could become a reality by the end of the decade...