For Brazil, it is tempting to have an agreement that makes it possible to quickly test a new vaccine on its own population.
127,000 people have died of covid-19 in the country, which is the second highest number of deaths in the world after the United States.
Nurse Fabiana Soares Santos is one of thousands of volunteers currently participating in the studies for a coronavina vaccine.
After her dizzying experiences while working in the intensive care unit, the willingness to help is greater than the fear of possible side effects.