Success and failure can be dictated by expectation and it is guiding the world towards the possibility of a pandemic coronavirus vaccine soon. The scientific community is committed, as never before, to making the discovery, and in record time, but the results of the tests that are beginning to emerge are not very encouraging. For now, vaccines have a level of protection slightly above the minimum required and we may all have to continue with a mask.
From the simplest to the most complex, all vaccines need to be at least 50% effective to be evaluated and approved by drug agencies worldwide. The bar is low, that is, it means that only half of the vaccinated people will not contract the disease for which they were protected, and for this reason the World Health Organization has already made it known that a vaccine with 70% or more immunization is desirable . The data that is being known does not get there: until now, they vary between 50% and 60%.