In clinical studies, the effectiveness of a vaccine is measured. They are controlled studies, under slightly more ideal conditions. They are used to check if the vaccine, in addition to being safe, provides levels of protection. Clinical studies are carried out under ideal conditions and are designed to evaluate the vaccine preparation under conditions with strict inclusion and exclusion criteria, which means that people are included for almost ideal conditions of immunocompetence, age, biochemical and hemochemical parameters, because, for the first time, the product is going to be evaluated, and that is why placebos groups are used.
