Brazil begins vaccinating against dengue in public health in the midst of the worst epidemic in 40 years. The South American giant is the first country in the world to immunize through Social Security, and plans to protect three million people.

This Friday the clinical trial began to understand how the vaccine works in adults between 18 and 40 years old. The tropical disease transmitted by the dreaded Aedes aegypti mosquito causes fever, muscle pain and, in the worst case, bleeding and death.